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Subset

/sˈʌˌbsɛt/
B1
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(noun) A set A such that every element of A is also an element of S.

In American English, stoats are a subset of weasels, while in British English, they aren't.
Mathematics is just a subset of type theory.
CEFR Practice Quiz
The researchers focused on a specific ____ of the data that dealt with the local weather patterns.

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