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English definition of “in”

in

preposition (DURING)    /ɪn/
A1 during part or all of a period of time: We're going to Italy in April. Some trees lose their leaves in (the) autumn. I started working here in 2009. Life in the 19th century was very different from what it is now. Bye, see you in the morning (= tomorrow morning). She was a brilliant gymnast in her youth (= when she was young). How many civilians died in the Vietnam War? This is the first cigarette I've had in three years. I haven't had a decent night's sleep in years/ages (= for a long time).Describing when something happened or will happenIn and at in between between the two times mentioned: I have breakfast at 7.30, lunch at 1.00, and sometimes a snack in between.Between Grammar:At, on and in (time)We use at:See moreGrammar:Other uses of in with timeWe use in to say how long it takes someone to do something:See moreGrammar:Time expressions without at, on, inWe don’t normally use at, on or in before time expressions beginning with each, every, next, last, some, this, that, one, any, all:See moreGrammar:At, on and in (time): typical errorsSee moreGrammar:In, intoIn and into are prepositions.See moreGrammar:In, into: position and directionWe use in to talk about where something is in relation to a larger area around it:See moreGrammar:Into: enthusiasm, interestWe use be into to express enthusiasm or strong interest for something:See moreGrammar:Change into, turn intoWe use into after verbs describing change:See moreGrammar:In: phrasal verbsWe use in to make a number of phrasal verbs:See more
(Definition of in preposition (DURING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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