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Definition of at preposition from the Oxford Advanced Learner's Dictionary

at

preposition
 
/ət/, strong form
 
/æt/
 
/ət/, strong form
 
/æt/
Idioms
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  1. used to say where something/somebody is or where something happens
    • at the corner of the street
    • We changed at Crewe.
    • They arrived late at the airport.
    • At the roundabout take the third exit.
    • I'll be at home all morning.
    • She's at Tom's (= at Tom's house).
    • I met her at the hospital.
    • How many people were there at the concert?
  2. used to say where somebody works or studies
    • He's been at the bank longer than anyone else.
    • She's at Yale (= Yale University).
  3. used to say when something happens
    • We left at 2 o'clock.
    • at the end of the week
    • We woke at dawn.
    • I didn't know at the time of writing (= when I wrote).
    • At night you can see the stars.
    • (British English) What are you doing at the weekend?
  4. used to state the age at which somebody does something
    • She got married at 25.
    • He left school at the age of 16.
  5. in the direction of or towards somebody/something
    • What are you looking at?
    • He pointed the gun at the target.
    • Somebody threw paint at the prime minister.
  6. used after a verb to show that somebody tries to do something, or partly does something, but does not succeed or complete it
    • He clutched wildly at the rope as he fell.
    • She nibbled at a sandwich (= ate only small bits of it).
  7. used with adjectives to show how well somebody does something
    • I'm good at French.
    • She's hopeless at managing people.
  8. used to show a rate, speed, etc.
    • He was driving at 70 mph.
    • The noise came at two-minute intervals (= once every two minutes).
    • Prices start at $1 000.
    • The book retails at £19.95.
  9. used to state the distance away from something
    • I held it at arm's length.
    • Can you read a car number plate at fifty metres?
  10. used to show the situation somebody/something is in, what somebody is doing or what is happening
    • The country is now at war.
    • I felt at a disadvantage.
    • I think Mr Harris is at lunch.
  11. at somebody’s/something’s best/worst, etc. used to say that somebody/something is as good, bad, etc. as they can be
    • This was Osaka at her best.
    • The garden's at its most beautiful in June.
  12. used with adjectives to show the cause of something
    • They were impatient at the delay.
    • She was delighted at the result.
  13. (formal) in response to something
    • They attended the dinner at the chairman's invitation.
  14. (North American English) used when giving a phone number
    • You can reach me at 637-2335, extension 354.
  15.  
    /æt/
     
    /æt/
    (computing) the symbol (@) used in email addressesTopics Phones, email and the interneta1
  16. Word OriginOld English æt, of Germanic origin; related to Old Frisian et and Old Norse at, from an Indo-European root shared by Latin ad ‘to’.
Idioms
at that
  1. used when you are giving an extra piece of information
    • He managed to buy a car after all—and a nice one at that.
be at it again
  1. to be doing something, especially something bad
    • Look at all that graffiti—those kids have been at it again.
where it’s at
  1. (informal) a place or an activity that is very popular or fashionable
    • Judging by the crowds waiting to get in, this seems to be where it's at.
See at in the Oxford Advanced American DictionarySee at in the Oxford Learner's Dictionary of Academic English
sufficiently
adverb
 
 
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