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English definition of “inside”

inside

preposition     /ˌɪnˈsaɪd/ (also inside of)
C2 If you do something or if something happens inside (of) a particular time or limit, you do it or it happens in less than that amount of time or under the limit: The new faster trains can do the journey inside two hours. He finished it inside of two hours.Until a particular moment Grammar:InsideInside is an adjective, noun, adverb or preposition. We use inside when we refer to the inner part of something.See more
(Definition of inside preposition from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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