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This is How We'll “See” the Universe's First Second

Video vocabulary

fortunately

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US / ˈfɔ:tʃənətli /

UK / ˈfɔ:rtʃənətli /

A2
  • adverb
  • Through good luck; luckily

gravitational

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US / ˌgrævɪˈteɪʃənl /

UK / ˌɡrævɪˈteɪʃənl /

C1
  • adjecitve
  • Concerning the force of gravity

particle

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US / ˈpɑ:tɪkl /

UK / ˈpɑrtɪkəl /

B1
  • noun
  • Adverb or preposition that joins with a verb
  • Tiny piece or quantity of something

reality

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US / rɪ'ælətɪ /

UK / riˈælɪti /

A2
  • noun
  • What is true, as opposed to what is imagined

true

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US / tru: /

UK / tru: /

A1
  • adjecitve
  • Agreeing with the facts; not false; real or actual

certain

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US / ˈsə:tn /

UK / ˈsɚtn /

A1
  • adjecitve
  • Definite, fixed
  • Referring to an unspecified amount or quantity
  • Being sure about something; without doubt

combine

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US / kəmˈbaɪn /

UK / kəmˈbaɪn /

A2
  • verb
  • To mix several things together to form one thing

ever

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US / 'evə(r) /

UK / ˈɛvɚ /

A1
  • adverb
  • At any time; at all times in the future

metaphor

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US / ˈmetəfə(r) /

UK / ˈmɛtəˌfɔr, -fɚ /

B1
  • noun
  • Imaginative use of words to reveal a similarity

point

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US / pɔɪnt /

UK / pɔɪnt /

A1
  • noun
  • An item to be discussed
  • Small spot or dot
  • Fact or detail
  • Feature of something
  • The size of the text on a page or screen
  • A certain time or stage in a process
  • Certain position in time or space
  • Idea or fact you try to convince people about
  • Measurement of scores in a game, sport
  • Sharp end of something, e.g. a pen or pin
  • verb
  • To face a certain direction, e.g. north
  • To indicate something with your finger to others

sure

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US / ʃʊə(r) /

UK / ʃʊr /

A1
  • adjecitve
  • Having no doubts about something
  • Have confidence in your own words or actions
  • Firmly established or held; being firm or stable
  • Being correct or true
  • adverb
  • What you say to agree willingly

australia

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US / ɒˈstreɪliə /

UK / ɔːˈstreɪliə /

A1
  • noun
  • The smallest continent; between the South Pacific and the Indian Ocean

compute

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US / kəm'pju:t /

UK / kəmˈpjut /

A1
  • verb
  • To find out by calculating or estimating

exactly

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US / ɪgˈzæktli /

UK / ɪɡˈzæktli /

A1
  • adverb
  • No more and no less than; precisely

detector

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US / dɪˈtektə(r) /

UK / dɪˈtɛktɚ /

A2
  • noun
  • Device that receives a signal and responds to it

massive

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US / ˈmæsɪv /

UK / ˈmæsɪv /

B1
  • adjecitve
  • Very big; large; too big

peak

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US / pi:k /

UK / pik /

B1
  • noun
  • Part of a cap that sticks out over your eyes
  • The very top of a mountain
  • State when something is at its best
  • Time or point when the highest level occurs
  • verb
  • To reach the highest or best point

sort

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US / sɔ:t /

UK / sɔrt /

A1
  • noun
  • Group or class of similar things or people
  • verb
  • To organize things by putting them into groups
  • To deal with things in an organized way

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

A1
  • adverb
  • Used to add new (often different) information

confirmation

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US / ˌkɒnfəˈmeɪʃn /

UK / ˌkɑ:nfərˈmeɪʃn /

B1
  • noun
  • Approval or check of something
  • Statement something is real, true or accurate

use

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US / ju:s /

UK / ju:s /

A1
  • noun
  • Ability to employ something
  • Need to enable it to work
  • Permission to do something with something
  • Act of spending money
  • Operation of a machine for its function
  • verb
  • To have; to eat, drink, consume etc.
  • To need to operate or work
  • To operate a machine, e.g. a computer
  • To treat a person badly
  • To do something with, for a task or purpose

storage

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US / ˈstɔ:rɪdʒ /

UK / ˈstɔrɪdʒ, ˈstor- /

A2
  • noun
  • Act of storing something; a depository for goods

writhe

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US / raɪð /

UK / raɪð /

A1
  • verb
  • To twist from side to side, as in pain

after

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US / 'ɑ:ftə(r) /

UK / ˈæftɚ /

A1
  • adverb
  • Later than another time, or behind something
  • conjunction
  • Following something before
  • preposition
  • When an event happened or time has passed

already

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US / ɔ:lˈredi /

UK / ɔlˈrɛdi /

A1
  • adverb
  • Having happened or been done before this time

appear

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US / ə'pɪə(r) /

UK / əˈpɪr /

A1
  • verb
  • To be seen, become visible; come into sight
  • To seem to be
  • To act in a play, movie, or be mentioned in media

itself

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US / ɪtˈself /

UK / ɪtˈsɛlf /

A1
  • pronoun
  • Referring to it

many

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US / 'menɪ /

UK / ˈmɛni /

A1
  • determiner
  • Used to refer a large number of things

latency

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US / 'leɪtənsɪ /

UK / ˈletn:si /

B2
  • noun
  • State of being not yet evident or active

team

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US / ti:m /

UK / tim /

A1
  • noun
  • Group of people working on a task together
  • Group of people playing a sport together

tease

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US / ti:z /

UK / tiz /

B1
  • noun
  • Something said or done as a joke
  • verb
  • To purposefully bother an animal
  • To playfully embarrass or make fun of

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

wrinkle

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US / 'rɪŋkl /

UK / ˈrɪŋkəl /

B2
  • noun
  • Small folds in the skin, e.g. as a sign of age

album

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US / 'ælbəm /

UK / ˈælbəm /

A2
  • noun
  • Book with a collection of photographs or pictures

either

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US / ˈaɪðə(r) /

UK / ˈiðɚ, ˈaɪðɚ /

A1
  • adjecitve
  • One of two (used when there is a choice of two)
  • adverb
  • (After negative statements) likewise, in addition
  • conjunction
  • Used as the first of two connected things
  • determiner
  • Used as the first of two connected things
  • pronoun
  • The one or the other

compress

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US / kəmˈpres /

UK / kəmˈprɛs /

B1
  • verb
  • To press tightly together
  • To make smaller; reduce in time, size etc.

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

extreme

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US / ɪk'stri:m /

UK / ɪkˈstrim /

B1
  • adjecitve
  • Very great in degree
  • Farthest from a center
  • Very severe; very strong
  • noun
  • Effort that is thought more than is necessary

marble

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US / 'mɑ:bl /

UK / ˈmɑrbəl /

B1
  • noun
  • A hard type of stone, often used in monuments

new

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US / nju: /

UK / nu, nju /

A1
  • adjecitve
  • Not old, recently born, built or made
  • Being or doing something for the first time
  • Not felt, seen or known previously
  • Having been recently bought or obtained

lighthouse

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US / 'laɪthaʊs /

UK / ˈlaɪtˌhaʊs /

C1
  • noun
  • Tower with a light that warns ships about rocks

small

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US / smɔ:l /

UK / smɔl /

A1
  • adjecitve
  • Little in size; not big
  • (Of letters) not written in capital letters
  • Being insignificant or minor
  • (Of a business) with few people or things; local
  • (Of voice) being soft and quiet
  • (Of a child) being young

try

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US / traɪ /

UK / traɪ /

A1
  • noun
  • Act of putting the ball over the rugby goal line
  • verb
  • To make an effort, to attempt to do something
  • To examine someone or something in a court of law
  • To test to see if it is good or you like it
  • To make a person go through hardship; test
  • To examine something to see if it works

area

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US / 'eərɪə /

UK / ˈɛriə /

A1
  • noun
  • Amount of measured space
  • A specific section or space; part of a region
  • A subject or field of study

inflation

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US / ɪn'fleɪʃn /

UK / ɪnˈfleʃən /

B1
  • noun
  • Act of filling something with air or gas
  • Continual rise in the prices of products

knowledge

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US / ˈnɒlɪdʒ /

UK / ˈnɑlɪdʒ /

A1
  • noun
  • Information, understanding, or skill

plus

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US / plʌs /

UK / plʌs /

A2
  • noun
  • A benefit or advantage
  • preposition
  • In addition; add
  • In addition to; Indicates a number above
  • Having a value greater than zero

too

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US / tu: /

UK / tu /

A1
  • adverb
  • In addition, also; with emphasis
  • Say that something is more than you want

totally

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US / ˈtəʊtəli /

UK / ˈtotl:ɪ /

A1
  • adverb
  • In a complete way; completely; absolutely

declare

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US / dɪ'kleə(r) /

UK / dɪˈklɛr /

A2
  • verb
  • To make a statement in a strong and confident way
  • To show the cost of things purchased overseas
  • To say something in an official or sure way

four

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US / fɔ:(r) /

UK / fɔr, for /

A1
  • number
  • 4

imagine

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US / ɪ'mædʒɪn /

UK / ɪˈmædʒɪn /

A1
  • verb
  • To think creatively about; form mental picture of

global

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US / ˈgləʊbl /

UK / ˈgloʊbl /

A2
  • adjecitve
  • Concerning, involving, affecting all of something
  • Of, affecting, or involving the entire world

gravity

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US / ˈgrævəti /

UK / ˈɡrævɪti /

B1
  • noun
  • (Of a situation) extreme seriousness
  • Force making things fall towards the ground

million

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US / ˈmɪljən /

UK / ˈmɪljən /

A1
  • number
  • 1,000,000

inside

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US / ˌɪn'saɪd /

UK / ɪnˈsaɪd, ˈɪnˌsaɪd /

A2
  • adjecitve
  • Being in something
  • Being in a building
  • adverb
  • Into a house; indoors
  • noun
  • Inner part or surface of something

matter

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US / 'mætə(r) /

UK / ˈmætɚ /

A1
  • noun
  • Material all things are made of that fills space
  • Problem or reason for concern
  • verb
  • To be of great importance; to count

profile

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US / 'prəʊfaɪl /

UK / ˈproˌfaɪl /

B1
  • noun
  • A short description of a person or group
  • Shape of someone's head when viewed from the side
  • verb
  • To write a short description of a person or group

once

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US / wʌns /

UK / wʌns /

A1
  • adverb
  • One time; one instance
  • At a time in the past
  • conjunction
  • When; as soon as

publish

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US / 'pʌblɪʃ /

UK / ˈpʌblɪʃ /

A2
  • verb
  • To prepare and make available a book magazine etc.
  • To release information to the general public

wait

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US / weɪt /

UK / wet /

A1
  • verb
  • To delay or not do something until later
  • To spend time until an expected thing happens
  • To remain in a place until a thing happens

while

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US / waɪl /

UK / hwaɪl, waɪl /

A1
  • conjunction
  • In spite of the fact that; although
  • During the time that; at the same time
  • noun
  • Short amount of time

fabric

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US / ˈfæbrɪk /

UK / ˈfæbrɪk /

B1
  • noun
  • Cloth or material
  • Basic structure

now

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US / naʊ /

UK / naʊ /

A1
  • adverb
  • At the present time or moment
  • Right away or in the next possible moment
  • Used to refer to something that just happened
  • Time between the present and a moment in the past
  • conjunction
  • Resulting from or because of something

law

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US / lɔ: /

UK / lɔ /

A1
  • noun
  • Field of study that relates to the legal profession
  • A rule made and enforced by a government
  • System or rules made by the government

quiver

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US / 'kwɪvə(r) /

UK / ˈkwɪvɚ /

B2
  • noun
  • Container for arrows, worn across the back
  • verb
  • To shake with a slight, rapid, trembling movement

measure

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US / ˈmeʒə(r) /

UK / ˈmɛʒɚ /

A1
  • noun
  • Plan to achieve a desired result
  • Tool used to calculate the size of something
  • verb
  • To determine the value or importance of something
  • To calculate size, weight or temperature of

table

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US / ˈteɪbl /

UK / ˈtebəl /

A1
  • noun
  • Diagram that shows data in rows and columns
  • Raised flat surface you sit at to work or eat
  • verb
  • To leave an idea to be discussed at a later date

enter

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US / 'entə(r) /

UK / ˈɛntɚ /

A1
  • verb
  • To start a career or an education
  • To become a competitor in a contest
  • To add or type information in a computer
  • To go into a room, building etc.

nearly

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US / ˈniəli /

UK / ˈnɪrli /

A1
  • adverb
  • Not completely; almost

pole

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US / pəʊl /

UK / pol /

B1
  • noun
  • One of two opposite ideas, qualities or positions
  • Most northern or most southern point on a planet
  • A long, narrow piece of metal or wood
  • One of two opposite magnetic forces
  • An upright long thin structure to support things
  • verb
  • To move a boat with a stick or pole

telescope

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US / ˈtelɪskəʊp /

UK / ˈtelɪskoʊp /

C2
  • noun
  • Tube-shaped device used to see a great distance
  • verb
  • To shorten by compacting tubes inside each other

pack

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US / pæk /

UK / pæk /

A1
  • noun
  • Bag carried on the back of donkey, etc.
  • Group of people, animals, or objects
  • verb
  • To put things in a suitcase to go on a trip
  • To crowd a place with a large amount of things
  • To put something into a container to store it

smooth

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US / smu:ð /

UK / smuð /

A2
  • adjecitve
  • Moving without stops and starts
  • Pleasant and flat to touch, not rough
  • Being free from problems or difficulties
  • verb
  • To make something rough feel flat, e.g. by ironing
  • To spread a substance over a surface

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

tiny

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US / 'taɪnɪ /

UK / ˈtaɪni /

A2
  • adjecitve
  • Very, very small

interferometer

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US / ˌɪntəfɪə'rɒmɪtə /

UK / ˌɪntəfɪ'rɒmətə /

A1
  • noun
  • Any measuring instrument that uses interference patterns to make accurate measurements of waves

really

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US / ˈri:əli /

UK / ˈriəˌli, ˈrili /

A1
  • adverb
  • Used to stress something that is said; definitely
  • In a true or accurate manner
  • Very

study

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US / 'stʌdɪ /

UK / ˈstʌdi /

A1
  • noun
  • Room that a person studies or reads in
  • Piece of research
  • Topic or subject you research or learn about
  • verb
  • To focus on learning something usually at school

pick

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US / pɪk /

UK / pɪk /

A1
  • noun
  • Sharp tool used for breaking the ground
  • Item selected from a group of choices
  • verb
  • To take fruit or vegetables from a plant or tree
  • To decide on a thing from various choices; select
  • To remove (flower, etc.) with your fingers

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

currently

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US / ˈkʌrəntli /

UK / ˈkʌrənt(ə)li /

A2
  • adverb
  • Happening or being in the present time

clockwork

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US / ˈklɔkˌwɜ:k /

UK / ˈklɑkˌwə:k /

C1
  • noun
  • Any mechanism of geared wheels driven by a spring

internet

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US / ˈɪn.tə.net /

UK / ˋɪntɚ͵nɛt /

A1
  • noun
  • Worldwide computer network system

supermassive

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US / 'sju:pəmæsɪv /

UK / 'sju:pəmæsɪv /

A1
  • adjective
  • Having a mass many times (typically between 10⁶ and 10⁹ times) that of the sun.

want

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US / wɔnt /

UK / wɑnt, wɔnt /

A1
  • noun
  • Something you desire or wish for
  • State or condition of poverty
  • verb
  • To desire or wish for something; hope for a thing

yet

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US / jet /

UK / jɛt /

A1
  • adverb
  • At a later time (used after ‘not’)
  • (Used to emphasize that thing is, will be greater)
  • Eventually; at a future time
  • Until now; up to the present
  • conjunction
  • Adding to what has been said, often as a contrast

video

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US / 'vɪdɪəʊ /

UK / ˈvɪdiˌo /

A2
  • adjecitve
  • Of a moving film, with sound
  • noun
  • Recording capturing action with sound
  • verb
  • To make a moving film of, with sound

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

reproduce

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US / ˌri:prə'dju:s /

UK / ˌriprəˈdus, -ˈdjus /

B1
  • verb
  • To make a copy of something
  • To have children/young; grow roots/new plants

size

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US / saɪz /

UK / saɪz /

A1
  • noun
  • How big or small a thing is
  • Standard measurements for clothing, shoes
  • verb
  • To make something to fit a particular measurement
  • To organize or group from small to large

server

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US / 'sɜ:və(r) /

UK / ˈsɚvɚ /

A2
  • noun
  • A computer which distributes files to others
  • Person who gives food to others at a table

warp

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US / wɔ:p /

UK / wɔ:rp /

B2
  • noun
  • Twist or bend in something normally straight
  • Threads that go up and down on a loom, for weaving
  • verb
  • To influence someone to become bad/do evil thing
  • To become twisted out of natural or intended shape

whole

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US / həul /

UK / hol /

A1
  • adjecitve
  • Complete or full; all of
  • Being in a good condition
  • noun
  • Complete amount or sum; total

business

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US / ˈbɪznəs /

UK / ˈbɪznɪs /

A1
  • noun
  • A company formed for making profit
  • Matter that has to be dealt with; task; situation
  • Activity of working to make a profit

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

credit

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US / 'kredɪt /

UK / ˈkrɛdɪt /

A2
  • adjecitve
  • Having a positive amount of money
  • noun
  • System to buy something and pay for it later
  • Points earned instead of money
  • Quality of having a good reputation for a reason
  • Points earned towards a university degree
  • verb
  • To add a certain amount of money to a total
  • To recognize someone's achievements or help

cloud

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US / klaʊd /

UK / klaʊd /

A1
  • noun
  • A mass of smoke or mist hanging in the air
  • verb
  • To confuse the mind/judgment of a person
  • (Of the sky) to get darker and fill with clouds
  • To make (glass, etc.) difficult to see through
  • To make an activity less pleasant or enjoyable
  • (Of person's face, etc.) to show worry/anger

description

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US / dɪˈskrɪpʃn /

UK / dɪˈskrɪpʃən /

A2
  • noun
  • Explanation of what something is like, looks like

outward

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US / ˈaʊtwəd /

UK / ˈaʊtwəd /

B1
  • adjecitve
  • Going away from a place that will be returned to
  • Seeming to be from the outside
  • Concerning how something appears on the outside

pattern

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US / 'pætn /

UK / ˈpætən /

A2
  • noun
  • Model to follow in making or doing something
  • Colors or shapes which are repeated on objects
  • Regular repeated behavior
  • verb
  • To copy the way something else is made

support

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US / səˈpɔ:t /

UK / səˈpɔrt, -ˈport /

A1
  • noun
  • Assistance or advice given to someone
  • Evidence that helps prove something is true
  • A thing to hold up or prevent from falling down
  • verb
  • To give assistance or advice to someone
  • To help prove or show that something is true
  • To hold up or prevent from falling down

surprising

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US / səˈpraɪzɪŋ /

UK / sərˈpraɪzɪŋ /

A1
  • adjecitve
  • Making you feel a bit shocked because unexpected
  • verb
  • To do something that another person didn't expect

scale

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US / skeɪl /

UK / skel /

A2
  • noun
  • Size, level, or amount when compared
  • Small hard plates that cover the body of fish
  • Device that is used to weigh a person or thing
  • Range of numbers from the lowest to the highest
  • Dimensions or size of something
  • verb
  • To change the size of but keep the proportions
  • To climb something large (e.g. a mountain)
  • To remove the scales of a fish

whether

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US / ˈweðə(r) /

UK / ˈhwɛðɚ, ˈwɛð- /

A1
  • conjunction
  • If something will happen or not

but

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US / bət /

UK / bʌt,bət /

A1
  • conjunction
  • Used before you say something different, opposite

good

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US / ɡʊd /

UK / ɡʊd /

A1
  • adjecitve
  • Proper, appropriate or right
  • (Of an amount) enough; plenty
  • Excellent; high quality
  • Acting well or properly; of moral character
  • In a positive or happy emotional state
  • noun
  • Advantage or benefit

irregularity

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US / ɪˌregjəˈlærəti /

UK / ɪˌrɛɡjəˈlærɪti /

B1
  • noun
  • Not being normal or standard practice

expansion

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US / ɪkˈspænʃn /

UK / ɪkˈspænʃən /

B2
  • noun
  • Making or becoming larger

spiral

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US / 'spaɪrəl /

UK / ˈspaɪrəl /

B2
  • adjecitve
  • Curved in a continuous circle
  • noun
  • A continuous curve round a central point
  • verb
  • To move in a continuous curve round a point

signal

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US / 'sɪɡnəl /

UK / ˈsɪɡnəl /

A2
  • adjecitve
  • Most important or most noticeable
  • noun
  • Movement of a hand or other means to send messages
  • Act/sound that tells people to do/start something
  • Road-side lights that direct traffic to go or stop
  • Sound and light waves carrying TV and radio data
  • verb
  • To be evidence/an indication something will happen
  • To make a noise or motion to tell someone to start

star

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US / stɑ:(r) /

UK / stɑr /

A1
  • noun
  • Very famous person, usually an entertainer
  • Someone who does something very well
  • Your horoscope
  • A bright planet of hot gas in the night sky
  • A 5-6 sided asterisk-shape
  • verb
  • To perform or play a main role in a movie, play
  • To do something very well
  • To mark with a 5-6 sided asterisk-shape

also

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US / 'ɔ:lsəʊ /

UK / ˈɔlso /

A1
  • adverb
  • In addition; too; in a similar way

how

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US / haʊ /

UK / haʊ /

A1
  • adjecitve
  • To what degree? in what amount?
  • adverb
  • (Used to explain the way to do something)
  • exclamation
  • For what purpose or reason?
  • (Used to ask someone or something's condition)

humanity

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US / hju:ˈmænəti /

UK / hjuˈmænɪti /

A2
  • noun
  • Quality of being understanding or sympathetic
  • Human race as one group of people

kind

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US / kaɪnd /

UK / kaɪnd /

A1
  • adjecitve
  • In a caring and helpful manner
  • friendly and considerate
  • noun
  • One type of thing

payment

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US / ˈpeɪmənt /

UK / ˈpemənt /

A2
  • noun
  • Amount of money that is paid for something

louisiana

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US / luːˌiːziːˈænə /

UK / luˌiziˈænə /

A1
  • other
  • A state in southern United States on the Gulf of Mexico; one of the Confederate states during the Am

year

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US / jə: /

UK / jɪr /

A1
  • noun
  • Unit of time equal to 12 months or 365 or 366 days
  • Used to refer to the age of a person

you

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US / jʊ /

UK / ju /

A1
  • pronoun
  • Person someone is speaking or writing to
  • Person or people in general

entire

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US / ɪn'taɪə(r) /

UK / ɛnˈtaɪr /

A2
  • adjecitve
  • Complete or full; with no part left out; whole

interfere

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US / ˌɪntə'fɪə(r) /

UK / ˌɪntɚˈfɪr /

B1
  • verb
  • To get involved in something not your business

into

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US / 'ɪntə /

UK / ˈɪntu /

A1
  • preposition
  • Moving or going inside something
  • In the same direction as; in the direction of
  • So as to become; taking the state of

other

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US / 'ʌðə(r) /

UK / ˈʌðər /

A1
  • adjecitve
  • A thing different from that mentioned
  • determiner
  • (Something) else; not the first (one)
  • pronoun
  • Being the one and only thing of that category

one

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US / wʌn /

UK / wʌn /

A1
  • pronoun
  • You; we; people in general; someone
  • The thing or person previously referred to
  • adjecitve
  • Used to refer to people generally
  • Being a strong example of (something mentioned)
  • number
  • Number 1

open

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US / 'əʊpən /

UK / ˈopən /

A1
  • adjecitve
  • Available for use; accessible
  • Not being hidden; available for others to see
  • Being available for customers to enter or use
  • Allowing everyone to use or take part in
  • Not secret anymore
  • Not closed or shut
  • Willing to accept new ideas and thoughts
  • noun
  • Name for a tennis or golf competition
  • verb
  • To make accessible or able to be used, e.g. road
  • To start the activities or services of a business
  • To make a space or hole appear in something
  • To move or change so that it is no longer closed
  • To start something, e.g. a new business

turn

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US / tɜ:n /

UK / tɚn /

A1
  • noun
  • Place where changing of direction happens
  • Your time or chance to perform a duty
  • Your chance to play or do in say a game
  • Unexpected change, as in the weather
  • verb
  • To become (a particular age)
  • To become a different quality, color, etc.
  • To change the direction of something, e.g. a car
  • To move in an opposite direction or position
  • To shape metal with a spinning tool

than

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US / ðən /

UK / ðən /

A1
  • conjunction
  • Used to compare two things that are not equal

click

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US / klɪk /

UK / klɪk /

A1
  • noun
  • The sound a computer mouse makes when you press it
  • A short, slight, and sharp sound
  • verb
  • To work well with someone or something
  • To press a computer mouse
  • To make a short, slight, and sharp sound

giant

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US / 'dʒaɪənt /

UK / ˈdʒaɪənt /

A2
  • adjecitve
  • Very large, or much bigger than other things
  • noun
  • Tall, large, and powerful human-like creatures
  • Very successful, powerful person or organization

purely

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US / ˈpjʊəli /

UK / ˈpjʊrli /

A2
  • adverb
  • For no other reason; only and completely

spin

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US / spɪn /

UK / spɪn /

B1
  • noun
  • A dizzy feeling your head is turning around
  • A slant or hidden purpose, as in politicians' talk
  • A movement in a rapid turning motion
  • verb
  • To make a ball rotate when throwing it
  • To feel dizzy/confused, as in my head is spinning
  • To convert material such as cotton into thread
  • To move something in a rapid turning motion

sliver

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US / 'slɪvə(r) /

UK / ˈslɪvɚ /

C1
  • noun
  • Thin, often long piece of something, e.g. cheese

vantage

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US / ˈvɑːntɪdʒ /

UK / ˈvæntɪdʒ /

B2
  • noun
  • (usually vantage point) A place or position affording a good view of something
  • A fairly high level of ability in a foreign language according to the Common European Framework

able

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US / 'eɪbl /

UK / ˈebəl /

A2
  • adjecitve
  • Skilled; good at something
  • Having the ability to do something

multiple

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US / ˈmʌltɪpl /

UK / ˈmʌltəpəl /

B1
  • adjecitve
  • Having or involving more than one of something
  • noun
  • Number produced by multiplying a smaller number
  • Shop with many branches

simulate

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US / 'sɪmjʊleɪt /

UK / ˈsɪmjəˌlet /

B1
  • verb
  • To copy something or look or behave like it

surface

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US / 'sɜ:fɪs /

UK / ˈsɚfəs /

A2
  • adjecitve
  • Of the top layer; not deep or meaningful
  • noun
  • Top layer of the ground or of water
  • Nature or emotions that show, but may not be true
  • Outside or upper layer of something
  • verb
  • To give (road) a top layer
  • To appear after being hidden, unseen, or unknown
  • To come to the top of something; emerge
  • To come to the top level of water, mud, etc.

deep

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US / di:p /

UK / dip /

A1
  • adjecitve
  • Complex and important
  • Extreme or intense
  • Going far down from the surface
  • Low in pitch, as a sound
  • adverb
  • At a certain distance beneath the surface

electromagnetic

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US / ɪˌlektrəʊmægˈnetɪk /

UK / ɪˌlektroʊmægˈnetɪk /

A1
  • adjecitve
  • Having magnetic and electrical parts

brief

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US / bri:f /

UK / brif /

A2
  • adjecitve
  • (Of period of time) short; using few words
  • noun
  • Information and instructions given for a meeting
  • verb
  • To give information/instructions before a meeting

detectable

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US / dɪˈtektəbl /

UK / dɪˈtektəbl /

B1
  • adjecitve
  • Able to be detected

laser

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US / ˈleɪzə(r) /

UK / ˈlezɚ /

B1
  • noun
  • Strong narrow beam of high-powered light
  • Powerful beam of light used for cutting precisely

neutron

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US / ˈnu:ˌtrɔn, ˈnju:- /

UK / ˈnuˌtrɑn, ˈnju- /

A1
  • noun
  • Charge and mass about equal to a proton; enters into the structure of the atomic nucleus

timing

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US / ˈtaɪmɪŋ /

UK / ˈtaɪmɪŋ /

A1
  • noun
  • Measurement of how fast someone is
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

teach

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US / ti:tʃ /

UK / titʃ /

A1
  • verb
  • To help someone learn or do something

tweak

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US / twi:k /

UK / twik /

C1
  • noun
  • A small change or adjustment
  • verb
  • To make a small change or adjustment

state

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US / steɪt /

UK / stet /

A1
  • adjecitve
  • Concerning region within a country
  • noun
  • Region within a country, with its own government
  • Situation or condition something is in
  • verb
  • To say; declare as fact

truly

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US / 'tru:lɪ /

UK / ˈtruli /

A2
  • adverb
  • In accordance with truth, fact or reality; really

across

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US / əˈkrɔs /

UK / əˈkrɔs,əˈkrɑs /

A1
  • adverb
  • Distance from one side to another
  • (Go) from one side to the other of something

arm

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US / ɑ:m /

UK / ɑrm /

A1
  • noun
  • Part of your body from your shoulder to your hand
  • A branch of another object e.g. company
  • The side part of a chair where your arms go
  • The influence or power an authority has
  • verb
  • To activate a weapon or bomb for use
  • To give a gun or other weapon to a person or group

filter

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US / 'fɪltə(r) /

UK / ˈfɪltɚ /

B1
  • noun
  • Device to remove certain types of light, sound
  • Device to remove unwanted things from liquid, gas
  • verb
  • To remove certain types of light, sound
  • To remove unwanted substances from a liquid or gas

may

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US / meɪ /

UK / me /

A1
  • noun
  • 5th month of the year
  • other
  • Used to express a desire
  • Expresses permission, possibility or probability
  • Used to show that a thing could be true

play

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US / pleɪ /

UK / pleɪ /

A1
  • noun
  • Loose, free movement between two objects
  • Single action in a sports game
  • Performance in which people act in a theater
  • verb
  • To act as a character in a movie, or on stage
  • To perform music on an instrument
  • To use a device, e.g. a video game
  • To do something for enjoyment and fun
  • To do or perform a game or sport

ready

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US / 'redɪ /

UK / ˈrɛdi /

A1
  • adjecitve
  • Being likely or about to do something
  • Being willing to do a task
  • verb
  • To prepare something for use or action

smush

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US / /

UK / /

A1
  • transitive verb
  • Crush or smash.

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

truck

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US / trʌk /

UK / trʌk /

A2
  • noun
  • Homegrown vegetables and fruit for sale
  • Large vehicle suitable for transporting things
  • Simple frame with wheels for moving things; cart
  • verb
  • To transport something on a lorry, van

big

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US / bɪɡ /

UK / bɪɡ /

A1
  • adjecitve
  • Popular
  • Serious
  • Large

might

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US / maɪt /

UK / maɪt /

A1
  • other
  • Used to politely request an action
  • Used to express that something could happen
  • Power, strength, force or influence

james

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US / dʒeimz /

UK / dʒemz /

A1
  • proper noun
  • The name of seven Stuart kings of Scotland.
  • The name of two kings of England, Ireland, and Scotland.

little

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US / 'lɪtl /

UK / ˈlɪtl /

A1
  • adjecitve
  • Being short in length of time
  • Not great in size, amount, or degree; small
  • Being very young or younger than others
  • adverb
  • By an amount or degree that is not very much
  • Not often; rarely
  • noun
  • A person's name

lead

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US / li:d /

UK / lid /

A1
  • adjecitve
  • Being the main part in movies or plays
  • noun
  • Wire for electricity, computer, etc.; cable
  • Information that could help to solve a crime
  • Main part in a play or movie
  • Heavy, gray metal element
  • Rope used to tie something to stop it escaping
  • Act of being at the front in a race or game
  • verb
  • To show the way or guide others
  • To be at the front of a race or game
  • To travel in front of; go in advance of others

researcher

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US / rɪ'sɜ:tʃə(r) /

UK / rɪˈsətʃɚ /

A2
  • noun
  • Someone who works to find new facts and ideas

let

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US / let /

UK / lɛt /

A1
  • verb
  • To allow someone to do something
  • Introducing a suggestion to do something together
  • To rent a house, etc. to others

person

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US / 'pɜ:sn /

UK / 'pɜ:rsn /

A1
  • noun
  • Man, woman or child

stretch

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US / stretʃ /

UK / strɛtʃ /

A2
  • noun
  • Making arm, leg muscles longer to ease them
  • A consecutive row of things
  • A period of time
  • verb
  • To make your arm, leg muscles long to ease them
  • To make something bigger by pulling on it

unfortunately

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US / ʌnˈfɔ:tʃənətli /

UK / ʌnˈfɔːrtʃənətli /

B1
  • adverb
  • In a way that is to be regretted; unluckily

the

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US / ðə /

UK / ðə /

A1
  • article
  • Used to refer to something already mentioned
  • Used to show there is only one of something
  • determiner
  • Used to describe all of a family

collide

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US / kəˈlaɪd /

UK / kəˈlaɪd /

B1
  • verb
  • To come together or crash with a lot of force
  • To disagree with or be very different from others

below

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US / bɪ'ləʊ /

UK / bɪˈlo /

A1
  • preposition
  • In a lower position, place, or level

ones

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US / wʌnz /

UK / wʌnz /

A1
  • number
  • Number 1, a single person or thing

run

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US / rʌn /

UK / rʌn /

A1
  • noun
  • Journey between two places made by ship or car
  • Series of similar things or successes and failures
  • Act of running; exercise of running
  • verb
  • To depart or travel according to a schedule
  • To cause an animal to move in a certain direction
  • (Of an engine) to be operating
  • To start or use a computer program
  • To flow in a certain direction, like a liquid
  • To manage or operate a business
  • To operate or drive something
  • (Of a road) to go from one place to another
  • To move your legs faster than walking

suggest

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US / səˈdʒest /

UK / səɡˈdʒɛst, səˈdʒɛst /

A1
  • verb
  • To mention something that could be done; propose

make

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US / meɪk /

UK / mek /

A1
  • noun
  • Product made by a particular company; brand
  • verb
  • To arrange or prepare something e.g. dinner
  • To get to (a place) on time
  • To gain the status of (teacher, lawyer, etc.)
  • To create something by putting things together
  • To earn a certain amount of money at a job
  • To cause or force a person to do something
  • To cause something to happen or be formed

shine

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US / ʃaɪn /

UK / ʃaɪn /

A2
  • noun
  • Act of using a polish to clean shoes
  • verb
  • To point a light in a certain direction
  • To make something clean by using a polish
  • To make or produce a bright light

universe

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US / ˈju:nɪvɜ:s /

UK / ˈjunəˌvɚs /

B2
  • noun
  • All of space that contains planets and stars
  • Things surrounding a person, affecting their life

theoretical

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US / ˌθɪəˈretɪkl /

UK / ˌθiəˈrɛtɪkəl /

B1
  • adjecitve
  • Concerning the unproved aspects of a subject

accelerate

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US / əkˈseləreɪt /

UK / ækˈsɛləˌret /

B1
  • verb
  • To cause to occur earlier than expected
  • To increase the speed or rate of something

datum

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US / ˈdeɪtəm /

UK / ˈdetəm, ˈdætəm, ˈdɑtəm /

B1
  • noun
  • Item of factual information

his

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US / hɪz /

UK / hɪz /

A1
  • pronoun
  • Something belonging to a male person

origin

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US / ˈɒrɪdʒɪn /

UK / ˈɔrədʒɪn,ˈɑr- /

A2
  • noun
  • Point at which something begins or is created
  • Country or social group that a person comes from

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

could

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US / kəd /

UK / kʊd /

A1
  • other
  • Past form of 'can' to mean have ability
  • Used to ask for something politely, or to offer

behind

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US / bɪˈhaɪnd /

UK / bɪˈhaɪnd /

A1
  • adjecitve
  • Concerning a later or slower time than expected
  • Being in a losing position in a sporting event
  • Being in the past; old fashioned
  • adverb
  • Remaining
  • noun
  • The part of the body that one sits on
  • preposition
  • At or toward the back of someone or something
  • Supporting or helping someone

handle

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US / 'hændl /

UK / ˈhændl /

A2
  • noun
  • The part of a door you hold to open it
  • Thing you hold to carry or open a bag, pan etc.
  • verb
  • To cope with or take responsibility for
  • To control a machine, car etc.
  • To control or be controlled /used in a certain way
  • To deal with a particular situation/person; manage
  • To buy, sell, or move materials or goods
  • To hold, control, or use something with the hands
  • To touch objects with the hands to look at them

hole

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US / həʊl /

UK / hol /

A2
  • noun
  • An empty space, as in the ground, in a sock etc.
  • Fault or weakness in a plan, idea or explanation
  • Opening into or through something
  • An awkward or difficult situation
  • Dirty or unpleasant place with poor facilities
  • verb
  • (Golf) to get the ball into the hole

know

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US / nəʊ /

UK / noʊ /

A1
  • verb
  • To be familiar with a person or place, thing
  • To feel sure or be convinced about something
  • To discover or be aware of something
  • To be able to distinguish
  • To have knowledge of things

moment

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US / 'məʊmənt /

UK / 'moʊmənt /

A1
  • noun
  • Very short or brief period of time
  • A particular period in time

precise

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US / prɪ'saɪs /

UK / prɪˈsaɪs /

A2
  • adjecitve
  • (Of language details etc.) Very accurate and exact
  • (Of a time, place, quality) exact
  • Being very careful about how you do things

blow

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US / bləʊ /

UK / blo /

A2
  • noun
  • Something that causes you difficulty or sadness
  • Act of making air come out of your mouth
  • A hit or strike from an object
  • verb
  • To move something using air
  • To make air come quickly out of your mouth
  • To clear something by forcing air through it

bear

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US / bɛː /

UK / bɛr /

A2
  • noun
  • Large brown animal with fur that lives in forests
  • Someone who expects stock market to fall
  • verb
  • To accept (responsibilities or duties)
  • To give birth to a child; to produce fruit
  • To accept or suffer the weight of difficulties
  • To keep moving left or right while going forward
  • To show (sign of something)
  • To support the weight of something, e.g. a bridge

cosmic

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US / 'kɒzmɪk /

UK / ˈkɑzmɪk /

B2
  • adjecitve
  • Concerning space and the universe
  • Being so large, it is almost beyond understanding

clear

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US / klɪə(r) /

UK / klɪr /

A1
  • adjecitve
  • Empty; without anything in it or on it
  • Being certain and without doubt
  • Being without any streaks, spots, or cracks
  • Easy to understand; well-explained; obvious
  • adverb
  • Completely; entirely; through the whole of
  • Away from; free from
  • verb
  • To recover from or remove a problem
  • To get rid of the entire contents of
  • To give permission for something to happen
  • To make a place or surface empty by removing
  • To prove that someone is not guilty or to blame

hand

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US / hænd /

UK / hænd /

A1
  • noun
  • Cards given to a player in a card game
  • Piece of a clock that points to the time
  • Someone who performs physical tasks or work
  • Body part at the end of a person's arm
  • Help for someone performing a particular action
  • Condition of having power or influence
  • Member of the crew of a ship
  • verb
  • To give something to someone personally

mind

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US / maɪnd /

UK / maɪnd /

A1
  • noun
  • One's opinion or way of thinking about something
  • Part of humans that allows us to think or feel
  • verb
  • To be bothered or upset by something
  • To take care of someone e.g. as a bodyguard

problem

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US / ˈprɒbləm /

UK / ˈprɑbləm /

A1
  • adjecitve
  • Causing trouble
  • noun
  • Something difficult to deal with or causes trouble
  • Question to show understanding of a math concept

swimmer

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US / ˈswɪmə(r) /

UK / ˈswɪmər /

A1
  • noun
  • Someone who does swimming, e.g. as a sport

scientist

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US / ˈsaɪəntɪst /

UK / ˈsaɪəntɪst /

A2
  • noun
  • Person who is trained in a science

fundamental

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US / ˌfʌndəˈmentl /

UK / ˌfʌndəˈmɛntl /

A2
  • adjecitve
  • Forming a necessary part, base, or core
  • noun
  • A basic part of something
  • (Music) the lowest note in a harmony

hundred

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US / 'hʌndrəd /

UK / ˈhʌndrɪd /

A1
  • number
  • 100

world

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US / wɜ:ld /

UK / wɜrld /

A1
  • noun
  • All the humans, events, activities on the earth
  • Political division due to some kind of similarity

accord

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US / ə'kɔ:d /

UK / əˈkɔ:rd /

B1
  • noun
  • Agreement or harmony
  • An agreement or treaty between countries
  • verb
  • To be in harmony or agreement; consent
  • To give (someone) the respect due to them

flop

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US / flɒp /

UK / flɑ:p /

B2
  • noun
  • Book, movie etc. that is a total sales failure
  • Sound of something large hitting water
  • verb
  • To fall heavily, usually in a relaxed manner
  • To move loosely and without precision
  • (Of a show, program) to be a total failure

onto

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US / ˈɒntə /

UK / ˈɑnˌtu, -tə, ˈɔn- /

A1
  • preposition
  • Towards a certain direction/into a certain area

see

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US / si: /

UK / si /

A1
  • verb
  • To go on a date with someone
  • To predict whether something is, or will be true
  • To understand what someone says
  • To use your eyes to look at something
  • To visit a place often for sightseeing or pleasure
  • To visit or meet with someone
  • To find out by waiting or looking
  • To watch (a game, movie or TV show)

rely

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US / rɪ'laɪ /

UK / rɪˈlaɪ /

B2
  • verb
  • Depend on with full trust or confidence

century

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US / 'sentʃərɪ /

UK / ˈsɛntʃəri /

A1
  • noun
  • Period of 100 years

almost

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US / 'ɔ:lməʊst /

UK / ˈɔlˌmost, ɔlˈmost /

A1
  • adverb
  • Only a little less than, nearly, not quite

cover

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US / 'kʌvə(r) /

UK / ˈkʌvɚ /

A1
  • noun
  • A different version of another song
  • Bed sheets; blankets
  • (Police or military) protection from attack
  • Amount of money to be paid in an insurance claim
  • Thing you put over something to close or hide it
  • Front and back part of a book or magazine
  • Shelter built to protect from the natural elements
  • verb
  • To record a different version of another song
  • To include as part of its area
  • To put something over something to hide it
  • To discuss a subject in a talk or meeting
  • To form a layer over something so it is hidden
  • To have sufficient funds to pay for something
  • To include something within an agreed limit
  • To report news on TV, radio or in a newspaper
  • (Police or military) to protect from attack
  • To travel a certain distance in a given time
  • To wrap something with something, such as a cloth

before

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US / bɪˈfɔ:(r) /

UK / bɪˈfɔr,-ˈfor /

A1
  • adverb
  • At a time earlier than the present; previously
  • conjunction
  • In advance of something happening
  • preposition
  • In front of someone or something

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

flash

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US / flæʃ /

UK / flæʃ /

B1
  • noun
  • Sudden and brief appearance of something
  • Light used by a camera to brighten the area
  • Sudden feeling, idea or occurrence
  • Publicly exposing your genitals to others
  • Sudden bright light
  • Showing something very quickly and briefly
  • Light used in the dark, powered by batteries
  • verb
  • To appear suddenly and briefly
  • To publicly expose your genitals to others
  • To shine brightly very suddenly and briefly
  • To show something very quickly and briefly

part

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US / pɑ:t /

UK / pɑ:rt /

A1
  • adjecitve
  • To some degree; half; not fully
  • noun
  • Division of a book
  • Ratio of something, e.g. 3 of gin, 1 of tonic
  • A line in a person's hair, made with a comb
  • Character an actor plays on stage, movie, or TV
  • Some, but not all of a specific thing
  • Role in causing something to happen
  • verb
  • To make a line in a person's hair, by using a comb
  • To move two things apart creating a space
  • To leave someone, or to break off a relationship

machine

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US / mə'ʃi:n /

UK / məˈʃin /

A1
  • noun
  • Piece of equipment used to do work
  • Powerful group who control and organize things
  • verb
  • To shape, work on something, using a device

collaboration

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US / kəˌlæbəˈreɪʃn /

UK / kəˌlæbəˈreɪʃn /

B1
  • noun
  • Act of working with someone to complete a task

history

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US / 'hɪstrɪ /

UK / ˈhɪstəri /

A2
  • noun
  • Established pattern or record
  • Study of past events as an academic subject

increase

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US / ɪn'kri:s /

UK / ɪnˈkris /

A1
  • noun
  • Fact of increasing; amount something grows by
  • verb
  • To make or become larger in size or amount

sun

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US / sʌn /

UK / sʌn /

A1
  • noun
  • Light and heat coming from a large star in the sky
  • Hot shining star the Earth moves around
  • verb
  • To lie in the sunshine and enjoy its warmth

weak

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US / wi:k /

UK / wik /

A1
  • adjecitve
  • Not having a strong character
  • Less valuable compared to money of other countries
  • Ineffective; unconvincing; not strong
  • Having little power or ability
  • Not having the necessary or proper amount
  • Having little power; not strong; easy to break
  • (Of a drink) having lots of water and little taste

center

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US / 'sentə /

UK / ˈsɛntɚ /

A1
  • noun
  • Community place people go health or social reasons
  • Place in the middle of something
  • Person or thing that is attracting attention
  • verb
  • To direct focus toward something

end

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US / end /

UK / ɛnd /

A1
  • noun
  • The point where a process or activity stops
  • A point that marks the limit of something; finish
  • Goal or desired result
  • The tip, edge or limit of something
  • verb
  • To be the last part of something

discovery

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US / dɪ'skʌvərɪ /

UK / dɪˈskʌvəri /

A2
  • noun
  • Learning something for the first time

explore

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US / ɪk'splɔ:(r) /

UK / ɪkˈsplɔr /

A2
  • verb
  • To examine something in detail to learn about it
  • To travel to a place to discover more about it

fall

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US / fɔ:l /

UK / fɔl /

A1
  • noun
  • Season after summer and before winter; Autumn
  • A drop in amount; decrease
  • Dropping from a standing position to the ground
  • verb
  • To drop in amount; to decrease
  • To come down from a higher position suddenly
  • To go from standing to the ground, by accident

manage

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US / ˈmænɪdʒ /

UK / ˈmænɪdʒ /

A1
  • verb
  • To survive hardships and difficulties; to cope
  • To run or operate a business by directing others

china

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US / ˈtʃaɪnə /

UK / ˈtʃaɪnə /

A1
  • noun
  • A communist nation that covers a vast territory in eastern Asia; the most populous country in the wo
  • other
  • High quality porcelain originally made only in China

figure

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US / ˈfiɡə /

UK / ˈfɪɡjɚ /

A1
  • noun
  • Your body shape
  • Numbers in a calculation
  • Doll-like thing meant to represent a person
  • Picture or diagram giving information in a text
  • Person who is very important or famous
  • Shape of a person seen indistinctly or in outline
  • Amount that is expressed in numbers
  • verb
  • To appear in a game, play or event
  • To calculate how much something will cost
  • To understand after thinking; work out

direction

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US / də'rekʃn /

UK / dɪˈrɛkʃən, daɪ- /

A2
  • noun
  • When someone tells people what to do
  • Describes the way you are going, e.g. North

lake

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US / leɪk /

UK / lek /

A2
  • noun
  • Large area of water surrounded by land

move

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US / mu:v /

UK / muv /

A1
  • noun
  • Act of moving a playing piece in chess, etc.
  • An action; doing something
  • Step taken to achieve a goal
  • verb
  • To cause someone to have certain emotions
  • To cause something to change to a different place
  • To change where people live or a business operates
  • To take action to do or achieve something

way

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US / weɪ /

UK / we /

A1
  • adverb
  • Used to emphasize the amount of something
  • noun
  • Particular aspect of something being thought about
  • One of various choices that could be made
  • Particular existing condition or state
  • (Often long) distance or length of time
  • How something is done
  • Route to go to a place
  • Small street
  • Usual behavior, emotions or habits of someone

their

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US / ðɛː /

UK / ðer /

A1
  • determiner
  • Belonging to them

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

interstellar

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US / ˌɪntəˈstelə(r) /

UK / ˌɪntərˈstelə(r) /

C1
  • adjecitve
  • Being in the space between stars or star systems

isolate

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US / ˈaɪsəleɪt /

UK / ˈaɪsəˌlet /

B1
  • verb
  • To identify, consider, or deal with separately
  • To keep in a place or situation apart from others
  • To separate something from another substance

space

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US / speɪs /

UK / spes /

A1
  • noun
  • Empty area kept for a specific reason, like a car
  • Empty area with nothing in it
  • Area in the sky where the stars are
  • Area between written words on a page
  • verb
  • To make a certain distance or time between

subatomic

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US / ˌsʌbəˈtɒmɪk /

UK / ˌsʌbəˈtɑmɪk /

B1
  • adjecitve
  • Concerning constituents of the atom

pin

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US / pɪn /

UK / pɪn /

A2
  • noun
  • A piece of jewelry worn pinned to clothes
  • Short for Personal Information Number
  • Small thin thing with a sharp point, for attaching
  • verb
  • To hold someone down so that they can't move
  • To fasten things together using a sharp point

show

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US / ʃəʊ /

UK / ʃo /

A1
  • noun
  • False display of love, emotion or action
  • An event for displaying or promoting goods
  • Play, opera or theater production
  • Presentation that is broadcast on TV or radio
  • verb
  • To be easily seen or displayed
  • To display your emotions or feelings
  • To let someone see something; display
  • To explain or teach how something is done
  • To lead someone somewhere; point them to something
  • To prove something to be true, correct
  • To reveal or allow something to be seen

theory

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US / ˈθiəri /

UK / ˈθiəri, ˈθɪri /

A2
  • noun
  • Ideas or principles that explain facts or events

travel

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US / ˈtrævl /

UK / ˈtrævəl /

A1
  • noun
  • Going to other places, esp. distant places
  • verb
  • To go to a place that is far away

announce

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US / əˈnaʊns /

UK / əˈnaʊns /

A2
  • verb
  • To make a public statement about a plan, decision

background

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US / ˈbækgraʊnd /

UK / ˈbækˌɡraʊnd /

A2
  • noun
  • Images, color, or information behind the main one
  • Someone's personal work and educational history
  • A position not as important as the main event
  • Past events that influence things in the present

between

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US / bɪˈtwi:n /

UK / bɪˈtwin /

A1
  • preposition
  • From one person, thing, or place, to another
  • In the space that separates two objects
  • Among two or more people who share something

billion

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US / ˈbɪljən /

UK / ˈbɪljən /

A2
  • noun
  • Number 1,000,000,000

everything

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US / 'evrɪθɪŋ /

UK / ˈɛvriˌθɪŋ /

A1
  • pronoun
  • All of the things mentioned

envision

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US / ɪnˈvɪʒn /

UK / ɪnˈvɪʒn /

C2
  • verb
  • To imagine or picture in your mind

principle

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US / ˈprɪnsəpl /

UK / ˈprɪnsəpəl /

A2
  • noun
  • Moral rule or belief governing a person's behavior
  • Natural law that explains how things work

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

very

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US / 'verɪ /

UK / ˈvɛri /

A1
  • adjecitve
  • Concerning a large degree or amount
  • adverb
  • A lot; much; many
  • Used to stress or emphasize a noun

einstein

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US / ˈaɪn.staɪn /

UK / ˈaɪn.staɪn /

A1
  • noun
  • Albert Einstein, a German-born theoretical physicist

behemoth

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US / bɪˈhiːməθ /

UK / bɪˈhiːməθ /

C1
  • noun
  • Something that is abnormally large and powerful

general

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US / 'dʒenrəl /

UK / ˈdʒɛnərəl /

A1
  • adjecitve
  • Widespread, normal or usual
  • noun
  • Top ranked officer in the army

human

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US / 'hju:mən /

UK / ˈhjumən /

A1
  • adjecitve
  • Concerning or characteristic of people
  • noun
  • A person; a man, woman or child

kilometre

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US / ˈkɪləmi:tə(r) /

UK / ˈkɪləmiːtər /

A1
  • noun
  • A metric unit of length equal to 1000 metres

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

regular

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US / ˈregjələ(r) /

UK / ˈrɛɡjəlɚ /

A2
  • adjecitve
  • Having an equal amount of space or time in between
  • Occurring or being done frequently
  • Being normal, usual, or average
  • noun
  • Customers who frequently visit a place
  • Soldier who has a permanent job in the army

scishow

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US / /

UK / /

A1

thank

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US / θæŋk /

UK / θæŋk /

A1
  • verb
  • To tell someone you are grateful to them

account

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US / ə'kaʊnt /

UK / əˈkaʊnt /

A1
  • noun
  • An advantage
  • Arrangement with a bank to keep your money for you
  • An invoice for things bought
  • Arrangement whereby you can use online services
  • A description, often written, of events; report

constantly

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US / ˈkɒnstəntli /

UK / ˈkɑnstəntlɪ /

B1
  • adverb
  • Frequently, or without pause

evidence

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US / 'evɪdəns /

UK / ˈɛvɪdəns /

A1
  • noun
  • Factual proof that helps to establish the truth

pretty

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US / 'prɪtɪ /

UK / ˈprɪti /

A1
  • adjecitve
  • Being attractive to the eye in a simple way
  • adverb
  • Very; to a great degree

exponentially

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US / ˌekspə'nenʃəlɪ /

UK / ˌekspə'nenʃəlɪ /

C1
  • adverb
  • (Of an increase) at a faster and faster rate

relativity

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US / ˌreləˈtɪvəti /

UK / ˌrɛləˈtɪvɪti /

C2
  • noun
  • Einstein theory about time, space and position

rowboat

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US / ˈrəʊbəʊt /

UK / ˈroʊboʊt /

A1
  • noun
  • Small boat propelled by oars

speed

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US / spi:d /

UK / spid /

A2
  • noun
  • How fast or slow something is or is done
  • verb
  • To move quickly when completing an action
  • To drive a vehicle faster than laws allow

build

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US / bɪld /

UK / bɪld /

A1
  • noun
  • Your physical shape; physique
  • verb
  • To establish e.g. a reputation, over time
  • To construct a house, office, factory

old

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US / əʊld /

UK / old /

A1
  • adjecitve
  • Having existed for a long time, not young or new
  • Age of a person since birth

washington

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US / 'wɒʃɪŋtən /

UK / 'wɑ:ʃɪŋtənˌ 'wɔ:ʃɪŋ- /

A1
  • other
  • A state in northwestern United States on the Pacific

work

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US / wɜ:k /

UK / wɚk /

A1
  • adjecitve
  • Activity completed in order to make money
  • noun
  • The product of some artistic or literary endeavor
  • Everything created by an author, artist, musician
  • Activity you do in order to make money
  • Place of employment
  • Final product or result of a some labor or effort
  • verb
  • To bring into a specific state of success
  • To be functioning properly, e.g. a car
  • To do your job in your company or workplace
  • To make an effort to do something
  • To operate a machine or device

all

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US / ɔ:l /

UK / ɔl /

A1
  • adverb
  • Completely; totally
  • determiner
  • Being every one of something
  • pronoun
  • 100% of something; the complete amount

drop

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US / drɒp /

UK / drɑp /

A1
  • noun
  • Distance between a higher and a lower level
  • Act of letting something fall (from your hand)
  • A decrease in quantity or quality; reduction
  • Tiny amount of liquid, with rounded bottom
  • verb
  • To drive someone to a place and then drive away
  • To let something fall from your hand
  • To fall or lie down quickly, as when shot
  • To decide to stop something e.g. a course)
  • To (cause to) reduce in quantity or quality

its

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US / ɪts /

UK / ɪts /

A1
  • adjecitve
  • Referring to or belonging to ‘it’
  • determiner
  • Of something; belonging or related to something
  • other
  • Possessive form of “it”

produce

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US / prə'dju:s /

UK / prəˈdus, -ˈdjus, pro- /

A1
  • noun
  • Fresh foods such as fruits and vegetables
  • verb
  • To grow something naturally
  • To make something appear
  • To manufacture something using machines
  • To control the making a movie or television show

fast

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US / fɑ:st /

UK / fæst /

A1
  • adjecitve
  • In a way that is difficult to move or change
  • Moving or able to move quickly
  • Showing time that is later than the actual time
  • adverb
  • With a great deal of speed
  • noun
  • Period of time when a person chooses not to eat
  • verb
  • To refuse food for a long time

ripple

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US / 'rɪpl /

UK / ˈrɪpəl /

B2
  • noun
  • Small gentle low wave on the surface of water, etc.
  • Sound/noise/laughter that changes in volume
  • Feeling or emotion that spreads through a person
  • verb
  • To travel or move as small, gentle waves
  • To be spread through a person or group

add

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US / æd /

UK / æd /

A1
  • verb
  • To include as well
  • To put two things or numbers together, e.g. 2+2

discover

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US / dɪˈskʌvə(r) /

UK / dɪˈskʌvɚ /

A2
  • verb
  • To find something new that was not known before

opaque

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US / əʊˈpeɪk /

UK / oʊˈpeɪk /

C2
  • adjecitve
  • Hard to see through; cloudy
  • Being hard to understand

link

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US / lɪŋk /

UK / lɪŋk /

A2
  • noun
  • Any one of the rings that are part of a chain
  • Connection between two or more things or people
  • Webpage item you click to go to another webpage
  • verb
  • To join or connect together

spot

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US / spɒt /

UK / spɑt /

A2
  • noun
  • A certain place or area
  • A difficult time; awkward situation
  • Place or ranking on a list
  • A small amount of (substance help hard work etc.)
  • Mark caused by a drop of liquid, food, etc.
  • verb
  • To see someone or something by chance

take

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US / teɪk /

UK / tek /

A1
  • noun
  • Filming of a single scene for TV or the movies
  • verb
  • To accept something that is offered
  • To use a method of traveling, e.g. a bus or train
  • To use a camera to make (a photo)
  • To pick up something and go away with it
  • To study a subject in school
  • To attempt to pass (an exam)
  • To require a certain amount of time, money, space

baby

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US / ˈbeɪbi /

UK / ˈbeɪbi /

A2
  • adjecitve
  • Small in size; smaller than usual
  • noun
  • A very young child, who cannot yet speak
  • verb
  • To treat someone as if they were newly born

backward

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US / ˈbækwəd /

UK / ˈbækwəd /

A2
  • adjecitve
  • Less developed than others, as in technology
  • adverb
  • Toward the rear, what is behind or past
  • Towards a previous time
  • Towards a worse condition or a loss of progress
  • Opposite to the normal or accepted way
  • Toward what is behind you

merger

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US / 'mɜ:dʒə(r) /

UK / ˈmədʒɚ /

B1
  • noun
  • Combination of two or more companies into one

least

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US / li:st /

UK / list /

A1
  • adverb
  • In the smallest or lowest way
  • noun
  • Something that is of the lowest or smallest degree

right

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US / raɪt /

UK / raɪt /

A1
  • adjecitve
  • Correct or true
  • The south side of you looking at the rising sun
  • adverb
  • Exactly in a place or time
  • Being appropriate for a particular event
  • In a straight or direct manner
  • noun
  • Something you are legally or morally allowed to do
  • Ideal of what is just and good
  • Political view based on conservatism
  • verb
  • To fix something previously wrong or unjust
  • To make upright, as a boat that has turned over

cause

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US / kɔ:z /

UK / kɔz /

A2
  • noun
  • Belief, goal or organization that people support
  • Reason for
  • verb
  • To make something happen; create effect or result

corporation

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US / ˌkɔ:pəˈreɪʃn /

UK / ˌkɔːrpəˈreɪʃn /

A2
  • noun
  • Big company or a combination of several companies

own

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US / əʊn /

UK / on /

A1
  • adjecitve
  • Belong to oneself
  • determiner
  • Yours, his, hers, etc.; not belonging to another
  • pronoun
  • (Something) belong to myself
  • verb
  • To have something as your property

seconds

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US / 'sekəndz /

UK / 'sekəndz /

A1
  • other
  • Units of time; one sixtieth of a minute
  • Short periods of time you wait for someone
  • verb
  • To agree to support a proposal at a meeting

current

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US / 'kʌrənt /

UK / ˈkɚrənt, ˈkʌr- /

A2
  • adjecitve
  • Happening or being in the present time
  • noun
  • Electricity flowing through wires
  • Movement of water in a river, or air in the sky

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

boat

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US / bəʊt /

UK / bot /

A1
  • noun
  • Small form of transport for traveling on water
  • verb
  • To travel on a lake or river

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

eventually

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US / ɪˈventʃuəli /

UK / ɪˈvɛntʃuəli /

A2
  • adverb
  • After a long time; after many attempts; in the end

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

A1
  • adjecitve
  • Not of the same kind; unlike other things

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said

contort

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US / kənˈtɔ:t /

UK / kənˈtɔ:rt /

C2
  • verb
  • To twist into an unusual appearance or shape

anyone

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US / ˈeniwʌn /

UK / ˈɛniˌwʌn, -wən /

A1
  • pronoun
  • Any person

energy

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US / 'enədʒɪ /

UK / ˈɛnədʒi /

A2
  • noun
  • Physical or mental strength

enough

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US / ɪˈnʌf /

UK / ɪˈnʌf /

A1
  • adjecitve
  • Sufficient to answer the need
  • adverb
  • To a satisfactory degree
  • pronoun
  • Equal to what is needed; as much as required
  • Adequate number or amount

find

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US / faɪnd /

UK / faɪnd /

A1
  • noun
  • Object discovered by chance
  • Things that have been discovered from searching
  • verb
  • To become aware of something that is happening
  • To discover or meet by chance
  • To decide if someone is guilty of a crime, or not
  • To learn through study, research, or effort
  • To discover something by looking for it

great

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US / ɡreɪt /

UK / ɡret /

A1
  • adjecitve
  • Very large in size
  • Very important
  • Very good; fantastic; wonderful
  • adverb
  • Very good; better than before
  • noun
  • Successful and well-admired person

mean

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US / mi:n /

UK / min /

A1
  • adjecitve
  • Being good at
  • Nasty; unkind
  • Not liking to spend money; cheap; stingy
  • noun
  • Average of a set of numbers
  • verb
  • To express a particular idea or thought
  • To intend to do something in particular
  • To have a particular meaning or value

watch

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US / wɒtʃ /

UK / wɑtʃ /

A1
  • noun
  • Period of time someone is responsible for guarding
  • Device you wear on your wrist that shows the time
  • Official warning statement, e.g. of bad weather
  • verb
  • To keep in check, manage, or control something
  • To look at something for entertainment, e.g. TV
  • To guard a place or people; protect child, etc.
  • To look at carefully to work out what is happening
  • To protect and care for someone or something

bunch

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US / bʌntʃ /

UK / bʌntʃ /

B1
  • noun
  • A group of things of the same kind
  • verb
  • To group people or things closely together
  • (Cloth) to gather/be gathered together in folds

down

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US / daʊn /

UK / daʊn /

A1
  • adjecitve
  • Being sad, sick, or unhappy
  • Not operating, working, or functioning as expected
  • adverb
  • In a sitting or lying position
  • Towards or on the ground, floor, or bottom
  • Written or copied onto a piece of paper or book
  • noun
  • A period of play in American Football
  • The soft, smooth hairs that cover a bird's body
  • preposition
  • Along something's path, course, or direction
  • Going from a higher position to a lower position
  • verb
  • To eat or drink very quickly and without stopping

during

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US / ˈdjʊərɪŋ /

UK / ˈdʊrɪŋ, ˈdjʊr- /

A1
  • preposition
  • At some point in the course of an event or thing

probe

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US / prəʊb /

UK / prob /

B1
  • noun
  • A thorough or deep examination of a problem
  • Device used to send information from outer space
  • Long medical instrument to look inside your body
  • verb
  • To carefully examine an issue by asking questions
  • To examine the inside of something using a tool

physic

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US / 'fɪzɪk /

UK / 'fɪzɪk /

A1
  • noun
  • (Archaic) medicine causing evacuation of the bowels

physicist

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US / ˈfɪzɪsɪst /

UK / ˈfɪzɪsɪst /

B2
  • noun
  • Person who studies and works in physics

slowly

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US / ˈsləʊli /

UK / ˈsloʊli /

A1
  • adverb
  • In an unhurried or not speedy manner

then

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US / ðen /

UK / ðɛn /

A1
  • adverb
  • A time that is not now
  • Following another thing in time or arrangement
  • Following on reasonably from what was just stated
  • At that time, not now

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

first

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US / fɜ:st /

UK / fɚst /

A1
  • adjecitve
  • 1st; Coming before all others in time or place
  • noun
  • Something that has not happened before
  • Position of the winner of a competition

roughly

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US / ˈrʌfli /

UK / ˈrʌflɪ /

B1
  • adverb
  • Approximately; (of numbers) about; around
  • In a manner that is violent or not careful
  • In an inexact, imprecise or violent way
  • In a basic, simple manner

second

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US / 'sekənd /

UK / ˈsɛkənd /

A1
  • adjecitve
  • 2nd; the one following first
  • noun
  • Unit of time; one sixtieth of a minute
  • Short period of time that you wait for someone
  • (Do) soon
  • verb
  • To agree to support a proposal at a meeting

birth

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US / bɜ:θ /

UK / bɜ:rθ /

A2
  • noun
  • Time when a baby or young animal is born
  • Beginning of something
  • Social position based on the family you come from

existence

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US / ɪɡ'zɪstəns /

UK / ɪɡˈzɪstəns /

A2
  • noun
  • State of being present, alive or real

emerge

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US / ɪ'mɜ:dʒ /

UK / ɪˈmɚdʒ /

A2
  • verb
  • To rise or appear out of some background

happen

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US / 'hæpən /

UK / ˈhæpən /

A1
  • verb
  • To take place or occur

each

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US / i:tʃ /

UK / itʃ /

A1
  • determiner
  • Every one of two or more things
  • pronoun
  • Per one person or thing

observable

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US / əbˈzɜ:vəbl /

UK / əbˈzɚvəbəl /

B1
  • adjecitve
  • Being able to be seen, noticed, or sensed

petabyte

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US / pe'teɪbi:t /

UK / pe'teɪbi:t /

A1
  • other
  • A unit of information equal to tebibytes or bytes
  • A unit of information equal to terabytes or bytes

typical

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US / ˈtɪpɪkl /

UK / ˈtɪpɪkəl /

A2
  • adjecitve
  • Normal; usual; expected

chirp

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US / tʃɜ:p /

UK / tʃɜ:rp /

C1
  • verb
  • To make a sharp sound like an insect, bird

proton

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US / ˈprəʊtɒn /

UK / ˈproʊtɑ:n /

B2
  • noun
  • Tiny part of atom with positive electrical charge

range

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US / reɪndʒ /

UK / rendʒ /

A2
  • noun
  • Cooking stove with multiple burners
  • Given distance from a point; how far plane can fly
  • Large grassy area where cattle wander and feed
  • Group or chain of mountains
  • Set of things with something in common
  • Limits within which something extends or varies
  • A set of products, e.g. so that people can choose
  • verb
  • To cover an area from one point to another
  • To extend to or vary within given limits
  • To put things in a row or in line
  • To wander or explore

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

astronomer

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US / əˈstrɒnəmə(r) /

UK / əˈstrɑ:nəmə(r) /

B2
  • noun
  • Scientist studying stars and other bodies in space

constant

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US / 'kɒnstənt /

UK / ˈkɑnstənt /

A2
  • adjecitve
  • Happening frequently or without pause
  • noun
  • Thing that happens always or at a regular rate

capable

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US / 'keɪpəbl /

UK / ˈkepəbəl /

A2
  • adjecitve
  • Being able to do something very well; proficient

churn

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US / tʃɜ:n /

UK / tʃə:n /

B2
  • verb
  • To turn milk round and round to make butter
  • To move round and round, as of stomach when ill
  • To move with vigorous agitation

few

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US / fju: /

UK / fju /

A1
  • pronoun
  • Not many, a small number

earth

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US / ɜ:θ /

UK / ɚθ /

A1
  • noun
  • Wire connecting an electrical device to the ground
  • The planet we live on
  • Soil in which we grow plants

extremely

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US / ɪkˈstri:mli /

UK / ɪk'strimlɪ /

B1
  • adverb
  • In a way that is much more than usual or expected

fact

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US / fækt /

UK / fækt /

A1
  • noun
  • Something that is known or proved to be true

reliable

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US / rɪˈlaɪəbl /

UK / rɪˈlaɪəbəl /

A2
  • adjecitve
  • Being likely to be true; believable
  • Deserving of your trust; dependable

perpendicular

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US / ˌpɜ:pənˈdɪkjələ(r) /

UK / ˌpə:pənˈdɪkjəlɚ /

C1
  • adjecitve
  • Being at right angles to a given line or plane

strong

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US / strɒŋ /

UK / strɔŋ /

A1
  • adjecitve
  • (Of tea or beer) dark or thick
  • Having big muscles; physically powerful

analogy

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US / əˈnælədʒi /

UK / əˈnælədʒi /

B1
  • noun
  • Comparison of things based on their similarity

chute

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US / ʃu:t /

UK / ʃut /

C1
  • noun
  • Sloping channel or passage to throw things down

compile

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US / kəm'paɪl /

UK / kəmˈpaɪl /

B1
  • verb
  • To put programming data into a computer
  • To gather (articles) for a book

frequency

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US / 'fri:kwənsɪ /

UK / ˈfrikwənsi /

B1
  • noun
  • Number of repetitions of (radio or sound) wave
  • How often something happens

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

observatory

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US / əbˈzɜ:vətri /

UK / əbˈzɜ:rvətɔ:ri /

A2
  • noun
  • Building built for studying and watching the stars

spend

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US / spend /

UK / spɛnd /

A2
  • verb
  • To use money to pay for something
  • To use time in order to do something
  • To use up something completely

solid

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US / 'sɒlɪd /

UK / ˈsɑlɪd /

A2
  • adjecitve
  • Being able to be trusted; reliable
  • Substance that is hard or of fixed shape
  • Being well made and expected to last long
  • Having no space or emptiness inside
  • Being made entirely of one material or substance
  • noun
  • Something firm or hard; not gas or liquid

time

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US / taɪm /

UK / taɪm /

A1
  • noun
  • Speed at which music is played; tempo
  • Point as shown on a clock, e.g. 3 p.m
  • Number of hours, minutes needed to do something
  • Occasion when something happens
  • Period or occasion that something occurred
  • Period in history or the past
  • Something measured in minutes, hours, days, etc.
  • How long an event takes; duration
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

short

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US / ʃɔ:t /

UK / ʃɔrt /

A1
  • adverb
  • Less than what is needed
  • Suddenly stopping what you are saying or doing
  • verb
  • (Of electric circuit) to spark because faulty
  • adjecitve
  • Measuring a small distance
  • Happening for a small amount of time
  • Unfriendly or rude

why

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US / waɪ /

UK / hwaɪ, waɪ /

A1
  • adverb
  • Question word to ask for a reason
  • exclamation
  • (Used to express surprise or approval)

through

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US / θru: /

UK / θru /

A2
  • adjecitve
  • having finished using or doing something
  • adverb
  • From the beginning of something until the end
  • preposition
  • Over, in, across an entire thing or place
  • Allowing you to pass between, or to
  • By a particular way or process; by the use of

wind

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US / wɪnd /

UK / wɪnd /

A1
  • adjecitve
  • (Musical instruments) that you blow into to play
  • noun
  • A current of air moving approximately horizontally, especially one strong enough to be felt
  • Something that has influence
  • verb
  • If a road, path, or river winds, it follows a route that turns repeatedly in different directions
  • To turn or cause something to turn
  • To twist around something

black

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US / blæk /

UK / blæk /

A1
  • adjecitve
  • Color of the sky on a dark night
  • noun
  • A person with dark skin, often of African origin
  • Person's name
  • verb
  • To fill in something to make it a very dark color

array

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US / əˈreɪ /

UK / ə'reɪ /

B2
  • noun
  • A regular order or arrangement of things
  • verb
  • To arrange things in a regular order

anyway

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US / ˈeniweɪ /

UK / ˈɛniˌwe /

A1
  • adverb
  • A word used to change the topic of a conversation

head

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US / hed /

UK / hɛd /

A1
  • noun
  • Counter for the number of cattle
  • Natural mental ability or intelligence
  • Leader or person with the greatest authority
  • Mind; mental ability; mental state
  • Side of a coin with a head on it
  • Top part of your body with eyes and a mouth
  • Starting point of something, e.g. a river
  • verb
  • To hit a ball with your head in a game
  • To be first or at the front or top (e.g. a list)
  • To travel or move toward a particular place; To go in a particular direction
  • To become the leader of something
  • To lead or be responsible for something

never

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US / 'nevə(r) /

UK / ˈnɛvɚ /

A1
  • adverb
  • Not ever; not at any time

period

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US / ˈpɪəriəd /

UK / ˈpɪriəd /

A1
  • noun
  • Set amount of time during which events take place
  • A way to emphasize what you will say
  • A full stop (.), marking the end of a sentence
  • A menstrual cycle
  • A set time for a class to be held

spacetime

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US / s'peɪstaɪm /

UK / s'peɪstaɪm /

A1
  • noun
  • The concepts of time and three-dimensional space regarded as fused in a four-dimensional continuum.

generate

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US / ˈdʒenəreɪt /

UK / ˈdʒɛnəˌret /

A2
  • verb
  • To create or be produced or bring into existence
  • To create electricity, heat, energy and power

meaningful

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US / 'mi:nɪŋfl /

UK / ˈminɪŋfəl /

A2
  • adjecitve
  • Having importance; showing someone's intention

object

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US / 'ɒbdʒɪkt /

UK / ˈɑbdʒɪkt /

A2
  • noun
  • Something you can see or touch, but is not alive
  • Goal or purpose of a particular plan or activity
  • The thing that the action of a verb acts upon
  • verb
  • To disagree; to protest against an idea or plan

simulation

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US / ˌsɪmjuˈleɪʃn /

UK / ˌsɪmjəˈleʃən /

B1
  • noun
  • A copying method to study the real world

subtly

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US / ˈsʌtli /

UK / ˈsəd(ə)li /

B1
  • adverb
  • In a way that is delicate or slight, but effective

vast

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US / vɑ:st /

UK / væst /

A2
  • adjecitve
  • Being very large in size or amount

clarify

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US / 'klærəfaɪ /

UK / ˈklærəˌfaɪ /

B1
  • verb
  • To make a liquid become clear or pure
  • To state again so that a point is clearer

disturb

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US / dɪˈstɜ:b /

UK / dɪˈstɜ:rb /

A2
  • other
  • To cause someone anxiety or fear
  • verb
  • To cause someone anxiety or fear
  • To stop someone from working or sleeping

fraction

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US / ˈfrækʃn /

UK / ˈfrækʃən /

B1
  • noun
  • Small part of something

grow

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US / ɡrəʊ /

UK / ɡro /

A1
  • verb
  • To get bigger and more mature; make plants do this
  • To improve; to develop better skills over time
  • To develop and become bigger or taller over time

source

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US / sɔ:s /

UK / sɔrs, sors /

A2
  • adjecitve
  • Produces or provides what is wanted or needed
  • noun
  • Piece of information; a person giving information
  • Place from which something necessary comes
  • verb
  • To get, e.g. a raw material, from somewhere

lower

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US / 'ləʊə(r) /

UK / ˈlaʊɚ, laʊr /

A2
  • adjecitve
  • In a position more near the bottom
  • verb
  • To move something downward to the ground

since

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US / sɪns /

UK / sɪns /

A1
  • adverb
  • At a point before the present time
  • conjunction
  • For this reason; because
  • preposition
  • From the time in the past that

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

within

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US / wɪˈðɪn /

UK / wɪðˈɪn, wɪθ- /

A1
  • adverb
  • Inside the limits of an area, time or range
  • preposition
  • From the inside of something

begin

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US / bɪ'ɡɪn /

UK / ˈbeɡɪn /

A1
  • verb
  • To do the first part of an action; to start

belly

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US / 'belɪ /

UK / ˈbɛli /

B2
  • noun
  • Middle part of the body; the stomach
  • verb
  • To expand outward; swell
  • To swell like a balloon

computer

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US / kəmˈpju:tə(r) /

UK / kəmˈpjutɚ /

A1
  • noun
  • Machine for storing data, accessing the internet

definitely

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US / ˈdefɪnətli /

UK / ˈdefɪnətli /

A2
  • adverb
  • Without question; beyond doubt

mass

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US / mæs /

UK / mæs /

B1
  • noun
  • Religious ceremony in some Christian churches
  • Large amount or number of something
  • Main or largest part of something
  • Large number of people considered as a whole
  • Amount of matter that an object has
  • verb
  • To gather people or things into a large group

pair

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US / peə(r) /

UK / per /

A2
  • noun
  • Two of the same thing, e.g. socks
  • Two people viewed together for some reason; couple
  • verb
  • To put two things or people together

job

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US / dʒɒb /

UK / dʒɑ:b /

A1
  • noun
  • Something that must be done
  • Regular work at which you earn money

raindrop

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US / ˈreɪndrɒp /

UK / ˈrenˌdrɑp /

C2
  • noun
  • Drop of rain

limited

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US / ˈlɪmɪtɪd /

UK / ˈlɪmɪtɪd /

B1
  • adjecitve
  • (Of a company) with a limit of financial liability
  • With restrictions; not broad in scope
  • verb
  • To stop or prevent an increase past a point

per

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US / pə(r) /

UK / pɚ /

A2
  • preposition
  • In the manner directed or suggested
  • For each; during each

soon

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US / su:n /

UK / sun /

A1
  • adverb
  • At a time not long from now

sound

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US / saʊnd /

UK / saʊnd /

A1
  • adjecitve
  • Sensible, dependable and reliable
  • Unbroken or undisturbed, as of sleep
  • Firm or solid in structure
  • Sane; not mentally ill
  • Clearly reasoned; involving sense, good judgment
  • noun
  • Unique quality that characterizes a style of music
  • Waves traveling in air or water that can be heard
  • verb
  • To seem or appear to be, from what was said
  • To say in a clear deliberate manner
  • To make a noise, e.g. to ring a bell

such

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US / sʌtʃ /

UK / sʌtʃ /

A1
  • determiner
  • Being similar to
  • (Thing) as previously stated or referred to
  • adverb
  • (Used to emphasize the quality of an adjective)

water

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US / 'wɔ:tə(r) /

UK / ˈwɔtɚ, ˈwɑtɚ /

A1
  • noun
  • Clear liquid that forms the seas, rivers and rain
  • Large area such as an ocean or sea
  • verb
  • (Of the eyes) to produce tears
  • (Mouth) to become wet at the thought of nice food
  • To pour liquids onto a plant to keep it alive

define

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US / dɪ'faɪn /

UK / dɪˈfaɪn /

A2
  • verb
  • To explain the meaning of words
  • To set or mark the limits of something

hunt

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US / hʌnt /

UK / hʌnt /

A2
  • noun
  • A search for animals to kill for food
  • Person's name
  • verb
  • To search for wild animals to kill (for food)
  • To look for very carefully; search for

math

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US / mæθ /

UK / mæθ /

A2
  • noun
  • Study or science of numbers and shapes

light

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US / laɪt /

UK / laɪt /

A1
  • adjecitve
  • Being bright making it easy to see; not dark
  • Being pale and lacking darkness of color
  • Not heavy; weighing only a little
  • adverb
  • Carrying few bags when traveling
  • noun
  • A source of energy that makes a room or area bright
  • Way in which something or someone is understood
  • verb
  • To cause something to burn; put a burning match to
  • To provide a way to see ahead

stuff

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US / stʌf /

UK / stʌf /

A1
  • noun
  • Generic description for things, materials, objects
  • verb
  • To push material inside something, with force

split

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US / splɪt /

UK / splɪt /

A2
  • adjecitve
  • No longer married or in a relationship
  • (Injured) by cutting it open, as in someone's lip
  • (Of a decision) when people cannot decide a winner
  • noun
  • Difference of opinion in a group causing a break
  • Separation or a break in something
  • verb
  • To become divided or broken along a straight line
  • To cause a cut in (lip, etc.)
  • To have difference of opinion in a group
  • To separate into two or more pieces
  • To divide something in an even or fair way

pop

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US / pɒp /

UK / pɑp /

B2
  • adjecitve
  • Type of music or art popular with many people
  • noun
  • Sweet soda drink
  • verb
  • To cause something to open or burst suddenly
  • To go to or in a place for a brief period of time

those

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US / ðəʊz /

UK / ðoz /

A1
  • determiner
  • The people or things we are talking about
  • pronoun
  • The objects far from the speaker

though

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US / ðəu /

UK / ðo /

A1
  • adverb
  • Although, despite the fact that

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

base

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US / beɪs /

UK / bes /

A2
  • noun
  • Place military personnel live, train, and operate
  • Bottom part of an object that touches a surface
  • Unit of counting, e.g. 10 for counting
  • Most important idea or ingredient to add others
  • Origin or start from which something came
  • Main place where an organization or a person works
  • verb
  • To use as the starting point or origin for
  • To have as the main location for (company, etc.)

back

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US / bæk /

UK / bæk /

A1
  • adjecitve
  • Farthest from the front e.g. in a classroom
  • adverb
  • Have returned to a place you were before
  • noun
  • The part of a chair that the upper body leans upon
  • Location at the rear of something
  • The reverse of side something
  • Area on the rear of your body
  • verb
  • To bet money on something
  • To go backwards in a car
  • To support and encourage someone or some cause

extrapolate

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US / ɪk'stræpəleɪt /

UK / ɪkˈstræpəˌlet /

C1
  • verb
  • To use facts to make guesses, opinions

galaxy

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US / 'ɡæləksɪ /

UK / ˈɡæləksi /

B2
  • noun
  • A group of stars and planets in space

intro

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US / ˈɪntrəʊ /

UK / ˈɪntroʊ /

A1
  • noun
  • Opening part of a text or piece of music

hope

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US / həʊp /

UK / hop /

A1
  • noun
  • When you wish something will happen; what you wish
  • verb
  • To expect and want something to happen

hopefully

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US / ˈhəʊpfəli /

UK / ˈhopfəli /

A2
  • adverb
  • In a manner wishing something to happen

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

major

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US / 'meɪdʒə(r) /

UK / ˈmedʒɚ /

A2
  • adjecitve
  • Main league; esp. referring to American baseball
  • Important, serious, or large in scope, size
  • noun
  • High-ranking officer in the army
  • Main subject you study at university
  • verb
  • To study a particular subject at university

until

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US / ənˈtɪl /

UK / ʌnˈtɪl /

A1
  • conjunction
  • Up to; to a time when something happens
  • preposition
  • Before (a specific time)

early

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US / ˈɜ:li /

UK / ˈɜ:rli /

A1
  • adjecitve
  • Happening or appearing before
  • adverb
  • Coming/happening before others in a time sequence
  • Happening sooner than expected

direct

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US / də'rekt /

UK / dɪˈrɛkt, daɪ- /

A2
  • adverb
  • Coming straight from something
  • verb
  • To tell someone in a very clear way to do something
  • To show the way by conducting or leading
  • To control the acting in a movie or play

merge

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US / mɜ:dʒ /

UK / mɜ:rdʒ /

B1
  • noun
  • Causing two or more things to combine into one
  • verb
  • To cause two or more things to combine into one
  • To be combined into one

most

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US / məʊst /

UK / most /

A1
  • adverb
  • Very; extremely
  • Greatest possible degree
  • pronoun
  • Nearly all of something

large

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US / lɑ:dʒ /

UK / lɑ:rdʒ /

A1
  • adjecitve
  • Big; of great size; broad, tall, wide, or fat

primordial

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US / praɪˈmɔ:diəl /

UK / praɪˈmɔ:rdiəl /

A1
  • adjecitve
  • Existing from the beginning of time; primary

meet

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US / mi:t /

UK / mit /

A1
  • noun
  • Sporting competition e.g. swimming
  • verb
  • To provide something that is necessary
  • To come together at a certain time or place

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

entirely

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US / ɪnˈtaɪəli /

UK / ɪnˈtaɪərli /

A2
  • adverb
  • Wholly; completely

form

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US / fɔ:m /

UK / fɔrm /

A1
  • noun
  • Sports team or person's current winning record
  • Document you complete when making an application
  • Visible shape or style; type; kind
  • verb
  • To organize something such as a club or group
  • To develop; to come into a shape or substance
  • To make something into a particular shape

out

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US / aʊt /

UK / aʊt /

A1
  • adverb
  • No longer stylish (e.g. fashion)
  • Away from home, business, or the usual place
  • In a direction/movement away from inside or center
  • noun
  • Act when a batter cannot continue playing
  • verb
  • To tell people a secret

over

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US / 'əʊvə(r) /

UK / ˈovɚ /

A1
  • adverb
  • Finished; no longer happening
  • Towards the ground/away from a standing position
  • noun
  • A set of six consecutive balls bowled in cricket
  • other
  • Finished
  • preposition
  • Showing the relation when a thing is above another
  • On or covering something
  • Above or across something
  • More than you need
  • From one side to the other
  • In the direction of; toward

swell

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US / swel /

UK / swɛl /

B1
  • noun
  • Being overcome from feeling a strong emotion
  • Act of growing in size or increasing in number
  • The size of the waves (surfing)
  • verb
  • To feel overcome due to a strong emotion
  • To increase in size or number larger than normal
  • To become larger than normal, often due to injury

beyond

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US / bɪ'jɒnd /

UK / biˈɑnd, bɪˈjɑnd /

A2
  • adverb
  • On or to the farther side
  • In addition to
  • preposition
  • Later in time than
  • Out of the limits of

finally

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US / ˈfaɪnəli /

UK / ˈfaɪnəli /

A1
  • adverb
  • used especially at the beginning of a sentence to introduce the last point or idea
  • After a long time or some difficulty

mess

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US / mes /

UK / mɛs /

A2
  • noun
  • Something that is untidy, dirty or unclean
  • verb
  • To make something untidy or dirty

monitor

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US / ˈmɒnɪtə(r) /

UK / ˈmɑ:nɪtə(r) /

A2
  • noun
  • A senior student at school
  • Electronic screen on which you can see images
  • verb
  • To observe and keep a record of something

keep

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US / ki:p /

UK / kip /

A1
  • noun
  • Large, strong tower in the middle of a castle
  • Money spent on you so you can live in a place
  • verb
  • To continue doing something; not to stop
  • To stop balls going in a goal in sports
  • To not give back or return something
  • (Of food) to not spoil or not rot
  • To take possession of something to own, e.g. a pet
  • To have and continue to hold something
  • To do something that you have promised or agreed
  • To stay in a certain place or condition
  • To maintain the rules

slash

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US / slæʃ /

UK / slæʃ /

B2
  • noun
  • Line ( / ) used in writing
  • Long, deep cut, caused by a sharp object
  • verb
  • To cut violently with a sharp object
  • To decrease something by a large amount

something

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US / ˈsʌmθɪŋ /

UK / ˈsʌmθɪŋ /

A1
  • adverb
  • In some degree or measure
  • noun
  • a person or thing of some value or consequence
  • pronoun
  • Thing that is not yet known or named
  • Approximately

call

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US / kɔ:l /

UK / kɔl /

A1
  • noun
  • A order or request for action
  • The sound an animal makes, often when in danger
  • A correct prediction, e.g. a decision in a game
  • A short visit to a place or person
  • A decision by a referee or umpire in a game
  • verb
  • To make a request or order for action
  • (Animal) to make sounds to warn of danger
  • To announce the date of an election
  • To make a judgment about something
  • To give someone or something a name
  • To guess in advance the result or outcome
  • To visit a place or person for a short time
  • To phone someone
  • To speak, announce or shout in a loud voice

dawn

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US / dɔ:n /

UK / dɔn /

B1
  • noun
  • First light of day
  • Person's name
  • verb
  • To begin to grow light as the sun rises
  • To begin to be understood for the first time

double

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US / 'dʌbl /

UK / ˈdʌbəl /

A2
  • adjecitve
  • Concerning or intended for use by two people
  • Two times the amount or degree; twice
  • Made of two parts that are the same, similar
  • noun
  • Person that is exactly like someone else
  • verb
  • To be used for two functions at the same time
  • To make or become twice as much

far

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US / fɑ:(r) /

UK / fɑr /

A1
  • adjecitve
  • A long way away
  • Being a long way away
  • adverb
  • To a large degree or extent

radiation

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US / ˌreɪdiˈeɪʃn /

UK / ˌrediˈeʃən /

B1
  • noun
  • Energy transmitted as rays, waves or particles
  • Process of emitting something in waves
  • Harmful waves of energy from nuclear activity

reduce

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US / rɪ'dju:s /

UK / rɪˈdus, -ˈdjus /

A2
  • verb
  • To try to decrease, e.g. your weight if overweight
  • To boil a liquid until it has decreased in amount
  • To make something smaller in size, amount, level

picture

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US / 'pɪktʃə(r) /

UK / ˈpɪktʃɚ /

A1
  • noun
  • General situation or state of being
  • Mental image of what something is or looks like
  • Movie; film
  • Painting, drawing or photograph on paper or screen
  • verb
  • To understand or imagine something
  • To imagine someone or something in an image

wonky

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US / ˈwɒŋki /

UK / ˈwɑ:ŋki /

A1
  • adjecitve
  • Turned or twisted toward one side

ancient

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US / 'eɪnʃənt /

UK / ˈenʃənt /

A2
  • adjecitve
  • Very old; having lived a very long time ago

correspond

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US / ˌkɒrəˈspɒnd /

UK / ˌkɔ:rəˈspɑ:nd /

B1
  • verb
  • To have similarity or equality with something
  • To write letters or emails to someone

real

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US / rɪəl /

UK / ˈriəl, ril /

A1
  • adjecitve
  • Actually existing or happening, not imagined
  • Being important or special

photo

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US / ˈfəʊtəʊ /

UK / ˈfoʊtoʊ /

A1
  • noun
  • Short for photograph; a picture taken by a camera

sometimes

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US / ˈsʌmtaɪmz /

UK / ˈsʌmˌtaɪmz /

A1
  • adverb
  • Only at certain times; occasionally

arrive

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US / əˈraɪv /

UK / əˈraɪv /

A1
  • verb
  • To reach the place you are traveling to

beast

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US / bi:st /

UK / bist /

B1
  • noun
  • Ugly or terrifying animal

any

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US / 'enɪ /

UK / ˈɛni /

A1
  • adjecitve
  • One, or some, no matter which
  • pronoun
  • One (thing) of many; some

come

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US / kʌm /

UK / kʌm /

A1
  • verb
  • To arrive at a place
  • (Of mail) to be delivered
  • To move toward someone; go with someone
  • To reach a certain point or state

distance

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US / 'dɪstəns /

UK / ˈdɪstəns /

A2
  • noun
  • Lack of friendliness toward another person
  • Amount of space between two places or things
  • verb
  • To make it clear that you are not involved

company

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US / 'kʌmpənɪ /

UK / ˈkʌmpəni /

A1
  • noun
  • Good feeling from being with someone else
  • A business that sells things or provides services
  • Guests, especially in your home
  • Being with another person rather than alone

gust

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US / gʌst /

UK / ɡʌst /

B2
  • noun
  • Sudden strong blast of wind
  • verb
  • (Of winds) to blow in a short sudden manner

help

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US / help /

UK / hɛlp /

A1
  • noun
  • Something given to enable a person to do something
  • Assistance given to someone in need
  • Someone who makes something easier or possible
  • verb
  • To act to enable a person to do something; assist
  • To make something better or less difficult

observe

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US / əbˈzɜ:v /

UK / əbˈzɜ:rv /

A2
  • verb
  • To celebrate a particular holiday/religious event
  • To obey or follow laws, rules, or customs
  • To watch carefully; to make a comment

squeeze

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US / skwi:z /

UK / skwiz /

C1
  • noun
  • Amount of liquid from firmly pressing e.g. orange
  • Act of putting pressure on, as to get liquid out
  • When there is not enough space for things/people
  • Act of firmly pressing on two or more sides
  • verb
  • To force or threaten someone to give you something
  • To strongly compress something to get liquid out
  • To be pressed together or crowded into an area
  • To press together the opposite sides of something
  • To reduce the amount of something

wave

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US / weɪv /

UK / wev /

A2
  • noun
  • Movement of sound, air or energy
  • Deep and strong emotion that is suddenly felt
  • Slightly curved shape in hair
  • Frequency of movement of objects together
  • Up and down movement of water in a lake or sea
  • Signal with your hand to say hello or goodbye
  • verb
  • To cause to move side to side or back and forth
  • To swing back and forth as a result of the wind
  • To move your hand or arm to say hello or goodbye

webb

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US / wɛb /

UK / wɛb /

A1
  • other
  • English sociologist and economist and a central member of the Fabian Society

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

completely

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US / kəmˈpli:tli /

UK / kəmˈpliːtli /

A1
  • adverb
  • In every way or as much as possible

detect

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US / dɪˈtekt /

UK / dɪˈtɛkt /

A2
  • verb
  • To discover or identify the presence of something

only

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US / ˈəunli /

UK / ˈonli /

A1
  • adverb
  • Just one; just that amount or thing; not more than
  • Not very important or serious
  • Just that type of thing, person
  • Short time ago; not before a certain time
  • conjunction
  • Except; but

possibility

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US / ˌpɒsə'bɪlətɪ /

UK / ˌpɑsəˈbɪlɪti /

A2
  • noun
  • Something with a chance of happening or being true

two

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US / tu: /

UK / tu /

A1
  • number
  • 2
  • Introduction to Video Content
  • This SciShow video, supported by Linode, explores how scientists are trying to observe the first moments after the universe was born by studying gravitational waves. Telescopes like the James Webb have allowed us to look deep into time and space, enabling us to see the first galaxies and hunt for the first stars. However, scientists want to go even further back in time and study the moments just slivers of a second after the universe was born. During this time, everything we know was packed into an area the size of a marble, space was opaque, and subatomic particles were a thing of the future. Unfortunately, because the universe was opaque, we will never be able to visually see this moment. However, scientists believe that this moment in time created wrinkles in the fabric of space, and these wrinkles may still exist as gravitational waves. If we can find these gravitational waves, it would help us understand how the universe came to be and what happened in the fractions of a second that defined its entire course. Gravitational waves were first predicted by Einstein's theory of general relativity in 1915, but they remained purely hypothetical for nearly a century. The theory showed that any object with mass accelerating through spacetime would warp spacetime, creating ripples that would propagate at the speed of light throughout the universe.
  • Subtitles section
  • This SciShow video is supported by Linode.
  • You can get a $100 60-day credit on a new Linode account at linode.com slash SciShow.
  • Thanks to state-of-the-art telescopes like the James Webb, we can look so deep into time and space that we can see some of the very first galaxies and hunt for the very first stars.
  • And other telescopes can take us even further back in time, to a point 380,000 years after the universe was born, when light first began to shine through space.
  • For a universe that's roughly 13.8 billion years old, that's a pretty solid baby picture.
  • But for scientists, it's not good enough.
  • They want to study just slivers of a second after the universe was born, when everything we know was packed into an area the size of a marble, space was opaque, and subatomic particles like protons and neutrons were a thing of the future.
  • The problem is, because the universe was opaque back then, we will never see this moment in time.
  • But we might be able to observe it anyway, using a completely different kind of signal — gravitational waves.
  • Astronomers think that this moment in time created wrinkles in the fabric of space.
  • And if it did, those wrinkles are still out there.
  • If we managed to find them, it would clarify how the universe came to be, and exactly what happened in the fractions of a second that defined the entire course of the universe.
  • INTRO
  • For nearly a century, gravitational waves were purely hypothetical.
  • Einstein published his theory of general relativity in 1915, and a completely mind-bending idea soon popped out of the math.
  • The math showed that any object with mass that was accelerating through spacetime would warp spacetime.
  • And that warping would ripple out into the greater universe at the speed of light.
  • As spacetime squeezed and stretched, the distances between objects would change.
  • Of course, we do not see the world around us warp every time a truck passes by or a plane takes off.
  • Gravitational waves are weak.
  • But according to general relativity, the more massive an object, and the faster it is moving, the stronger its gravitational waves will be.
  • So scientists eventually started to think that gravitational waves from the most extreme events in the universe might just be detectable if you could build a machine capable of measuring changes smaller than a proton.
  • Enter LIGO, the Laser Interferometer Gravitational Wave Observatory.
  • Actually, it is a pair of observatories that work together.
  • One's in Washington state, and the other is in Louisiana.
  • Each one has two arms that are four kilometers long and meet to form an L-shape.
  • And they are shaped that way because when a gravitational wave passes through space, that space will stretch in one direction and squeeze in the perpendicular direction.
  • So if a gravitational wave were to ripple through the observatory, one arm would get longer while the other one would get shorter.
  • In 2015, almost exactly a hundred years after Einstein's theory of general relativity dropped, LIGO picked up a brief little chirp made by the gravitational waves of two merging black holes, each roughly 30 times the mass of our Sun.
  • The discovery was not only a major confirmation of general relativity.
  • It also opened up a whole new way of exploring the universe, using gravity as a probe instead of light.
  • And once it was clear that any kind of gravitational wave was definitely real and definitely detectable, the idea of finding primordial gravitational waves—the ones created just after the dawn of reality as we know it—didn't sound that far-fetched.
  • But if any of these primordial waves were out there, we could not rely on LIGO to pick them up.
  • Just like human ears can only pick up sound waves within a certain frequency range, LIGO can't detect all gravitational waves.
  • It's limited to frequencies between roughly 10 and 10,000 peaks per second.
  • And the objects that churn out those frequencies are objects like your garden-variety black hole or neutron star, spiraling ever closer together until they smush.
  • Primordial gravitational waves, on the other hand, are an entirely different beast.
  • These would have been made during, or right after, a hypothetical period known as inflation that happened just after the birth of the universe.
  • During inflation, the observable universe swelled exponentially, going from a subatomic speck to about the size of a marble.
  • It was all over in a fraction of a second, like this many seconds.
  • But during this flash of expansion, our universe was dominated by constant, subatomically small fluctuations in energy that warped spacetime just like an object with mass does today.
  • And it's impossible for our earthling brains to truly envision this baby universe.
  • So, for now, let's just imagine a lake, plus a bunch of raindrops falling down onto that lake, creating ripples in the smooth surface.
  • According to our current knowledge of how physics works, as spacetime writhed in this early universe, gravitational waves rippled outward.
  • And as the universe doubled in size many times over during this split second, those hypothetical ripples turned into longer waves.
  • So in our metaphor, we would also need our lake to be growing, but that's okay, it's all inside of our minds.
  • We can totally make that happen.
  • Imagine the lake growing.
  • Currently, cosmologists don't know exactly how inflation played out.
  • They're not even 100% sure it happened.
  • And that's not too surprising, since we've never been able to observe that far back in time.
  • There could be multiple sources of these inflation-era gravitational waves.
  • Some may have even been generated by inflation ending.
  • But no matter how this split second of cosmic history went down, it was likely a time when space was getting stretched and contorted in extreme ways.
  • And this was bound to produce gravitational waves.
  • Then, as our tiny baby universe swelled to its current size, those waves stretched out.
  • What started as microscopic ripples would be light-years long now.
  • And that's why finding these ancient waves is not a job for LIGO.
  • Each one is billions of times longer.
  • The frequencies are billions of times lower than the waves LIGO can detect.
  • In fact, there is no way to build a LIGO-type detector on Earth that is long enough to pick up primordial gravitational waves.
  • The arms would need to stretch beyond Earth itself.
  • Fortunately, astronomers have found a way to do just that.
  • It's called a pulsar timing array.
  • A pulsar is a spinning neutron star that shoots electromagnetic radiation from its poles.
  • And from Earth's vantage point, that spinning makes the radiation appear to flash.
  • So basically, pulsars are like cosmic lighthouses.
  • And some of these lighthouses are flashing so steadily—the pulsars are spinning at such a precise speed—that their signals run like clockwork.
  • Or they do, until something disturbs the space between them and us.
  • And sometimes, that something is a gravitational wave.
  • Just like when a gravitational wave rolls through the Earth and ever-so-slightly stretches and compresses the arms of LIGO, it can do the same thing to interstellar space.
  • It changes the distance that light travels from a pulsar to the Earth, and that tweaks the arrival time.
  • A flash either arrives too soon or too late.
  • Now, gravitational waves aren't the only thing that can mess with a pulsar's timing, so astronomers have to account for a lot of other possibilities before declaring that a gravitational wave is behind any wonky signal.
  • But in principle, an array of extremely regular pulsars can work a lot like LIGO, just with a bunch more arms and blown up to an interstellar scale.
  • And this is how astronomers finally discovered evidence of low-frequency gravitational waves in 2023.
  • As part of a collaboration called Nanograv, researchers around the world compiled 15 years of data from 67 pulsars.
  • And what they found was not one isolated wave rolling through, like what LIGO spots.
  • Instead, the signal was sort of a background noise—a pattern of irregularities coming from all directions that suggests all of spacetime is subtly and slowly quivering.
  • But unfortunately, the Nanograv team doesn't know what's creating this gravitational wave background.
  • It's like if you had a bunch of rowboats and swimmers and gusts of wind creating waves in a lake, and you wanted to figure out which wave came from which source, but you could only look at the water and not the things on the water.
  • And when a bunch of waves interfere with each other, it's not easy to tease them apart.
  • The leading hypothesis is that these low-frequency waves are coming from supermassive black holes at the centers of merging galaxies.
  • Unlike the smaller black holes that LIGO detects, these behemoths spend millions of years slowly spiraling around each other before they finally collide.
  • Based on computer simulations, spiraling supermassive black holes could produce the signal that the Nanograv team observed.
  • And if a supermassive black hole merger is what caused these waves, it would be the first direct evidence of such an event ever happening.
  • But for now, there are still a few other possibilities on the table.
  • One of them is that these gravitational waves—or at least some of them—are primordial, created in the first second of the universe's existence.
  • Scientists on the Nanograv team also simulated what a low-frequency gravitational wave background would look like if it was created by inflation.
  • And those simulations reproduced what the researchers observed.
  • As their pulsar timing array provides more data, the Nanograv team hopes they'll be able to pin down the true origin of this signal.
  • Something that'll really help is figuring out how to tease apart different sources of gravitational waves based on the frequencies they generate.
  • Going back to the lake analogy, you can imagine that waves from a passing boat are going to look different from waves stirred up by the wind or by a person doing a belly flop.
  • So if scientists can figure out the typical profile of a gravitational wave produced by a supermassive black hole merger, they'll be able to filter out those signals and just look for the primordial waves.
  • If they ever find them, we'd have some of the strongest evidence yet that inflation really did happen.
  • And hopefully, the details of those primordial waves would teach us what exactly went down back then.
  • By studying a signal that's basically as old as the known universe, we'd finally be able to confirm whether or not some fundamental laws of physics work the way theoretical physicists think they do.
  • Which would be a lot better than looking at a picture from when the universe was 380,000 years old and trying to extrapolate backward.
  • But first, we need more data.
  • Astronomers need to find more pulsars that are reliable enough to add to Nanograv's array, and watch the array for even longer to see if meaningful patterns emerge.
  • Humanity will have to wait a while before anyone announces they've definitely detected a primordial gravitational wave.
  • But we might not have to wait as long as you might think, because Nanograv isn't the only collaboration doing this work.
  • Teams in China and Australia are also monitoring their own pulsar timing arrays, and all of these teams are working to combine their data to try and get an even clearer picture.
  • And even though it's using gravity instead of light to take that picture, making it a I am ready to add an even older baby picture to the universe's photo album.
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