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100

an idea or set of ideas that is intended to explain something about life or the world, especially an idea that has not been proved yet (noun)

theory

100

a subject or problem that is often discussed or argued about, especially a social or political matter that affects the interests of a lot of people (noun)

issue

100

an idea of how or what something is, or how something should be (noun)

concept

200

the situation, events or information that are related to something and help us understand it. (noun)

context

200

to continue to do something that has already been planned or started (verb)

proceed

200

to make something exist that did not exist before (verb)

create

300

having an important effect or influence / large enough to be noticeable (adjective)

significant

300

the money that you earn from your work or that you receive from your investments (noun)

income

300

detailed and exact (adjective)

specific

400

to happen (verb)

occur

400

the business of selling and sending goods to other countries (verb, noun)

export

400

make a law about something (verb)

legislate

500

to do something as a reaction to something that has been said or done (noun)

response

500

to find out the facts that will prove that something is true (verb)

establish

500

when several things that are all different from each other / something changes depending on the situation (verb)

vary

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