at

preposition21

1. •
   in or near a particular place, such as a shop or a bus stop

   • Caesar was at Rome.
   • A climate treaty was signed at Kyoto in 1997.
2. •
   Indicating distance or direction relative to the speaker.

   • Target at five miles. Prepare torpedoes.
   • Look out! UFO at two o'clock!
3. •
   Present or taking place during (an event).

   • Was he at the meeting?
   • There was a big fight at the class reunion.
4. •
   Indicating time of occurrence, especially an instant of time, or a period of time relatively short in context or from the speaker’s perspective.

   • Lafayette was major-general in the American army at the age of 18 […] — 1838
5. •
   (UK, Commonwealth) (also as at; before dates) On (a particular date).

   • at the date of the commencement of the proceedings before the judicial or administrative authority of the Contracting State where the child is — 1980
6. •
   Denotes a price.

   • 3 apples at 2¢ (each)
   • The offer was at $30,000 before negotiations.
7. •
   Indicates a position on a scale or in a series.

   • Sell at $90.
   • Tiger finished the round at tenth, seven strokes behind the leaders.
8. •
   Indicates a specific speed or rate that is maintained by something.

   • We were cruising along at well over the speed limit of fifty miles per hour.
   • It is growing at the rate of 3% a year.
9. •
   In the direction of; towards; (often implied to be in a hostile or careless manner).

   • Don’t just talk at someone; really listen to what they have to say.
   • Stones were thrown at us, but we couldn't see who did.
10. •
    Indicating action bearing upon something, especially continued or repeated action.

    • Don't pick at your food!
    • My cat keeps scratching at the furniture.
11. •
    On the subject of; regarding.

    • The twins were both bad at chemistry.
    • He slipped at marksmanship over his extended holiday.
12. •
    Occupied in (activity).
13. •
    In a state of.

    • The two countries are at war.
    • She is at sixes and sevens with him.
14. •
    In response or reaction to.

    • At my request, they agreed to move us to another hotel.
    • He jumped at the sudden noise.
15. •
    Attending (an educational institution).

    • She's at Oxford University, studying chemistry.
16. •
    Working for (a company) or in (a place or situation).

    • He used to be at Lehman Brothers. Now he's at Merrill Lynch.
    • 'Where does he work?' — 'I think he's still at the solicitors.'
17. •
    Also used in various other idiomatic combinations: at a pinch, at all, at fault, at pains, at risk, at that, etc.; see the individual entries.
18. •
    Subject to.

    • We hope that the event will go ahead, but we are at the whim of the weather.
    • The city was at the mercy of the occupying forces.
19. •
    In certain phrases, used to indicate the manner in which something happens or is done.

    • The car came towards me at speed.
    • He spoke at great length on the topic.
20. •
    Indicates a means or method.

    • 'How was the painting sold?' — 'At auction.'
21. •
    (Ireland) Bothering, irritating, causing discomfort to.

    • I think ‘Jesus, my back is at me’. Then I get the ball. Off you go for 10 yards and you don’t feel a thing. Then you stop and think: ‘Jesus, it’s at me again’[.] — 1995

noun1

1. •
   The at sign (@).

noun9

1. •
   Ukrainian initialism of акціонерне товариство (akcionerne tovarystvo, “JSC”)
2. •
   Initialism of assistive technology.
3. •
   Initialism of appropriate technology.
4. •
   Initialism of alternate timeline.
5. •
   Initialism of anaerobic threshold.
6. •
   Abbreviation of air tanker.
7. •
   Initialism of activity theory.
8. •
   Initialism of aerotriangulation.
9. •
   (US, Navy) Initialism of auxiliary tugboat.

adjective1

1. •
   Initialism of antitank.