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English definition of “at”

at

preposition (TIME)    weak /ət/ strong /æt/
A1 used to show an exact or a particular time : There's a meeting at 2.30 this afternoon . Are you free at lunchtime ? In theory , women can still have children at the age of 50. The bells ring at regular intervals through the day . At no time / point did the company do anything illegal . I'm busy at the moment (= now) - can you call back later ? It's a shame I wasn't here to meet you - I was in London at the time (= then).Describing when something happened or will happen Grammar:AtAt is a preposition. We use at to refer to time or place. We also use it to refer to activities.Grammar:At: timeWe use at to talk about points in time, ages and some periods of time:Grammar:At: placeWe use at to describe a position or location seen as a point:Grammar:At: group activitiesWe use at to refer to activities which involve a group of people:Grammar:Good at, bad atWe use adjective + at to talk about things that we do well or badly:Grammar:At: numbersIn specific contexts, we use at with numbers.Grammar:At: directionWe use at after a verb when we are talking about directing something towards another person or thing, often with verbs of perception and communication (smile at, shout at, wave at):Grammar:At or at theWhen we talk about buildings, we often use at the to refer to the building itself. When we refer to the activity that happens in the building, we don’t use the after at or in:Grammar:At: typical errorsGrammar:At, on and in (time)We use at:Grammar:Other uses of in with timeWe use in to say how long it takes someone to do something:Grammar: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:Grammar:At, on and in (time): typical errors
(Definition of at preposition (TIME) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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