1. on; in; near; by: at is the preposition of general (usually static) location, and is replaced by in, on, etc. when a more precise indication of location is needed at the office, at the edge of town
2. 1. to or toward as the goal or object look at her, swing at the ball, don't shout at me
   2. criticizing, attacking, pestering, etc. the critics are at him again
3. through come in at the front door
4. from get the facts at their source
5. attending at the party
6. occupied in; busy with at work
7. in a condition or state of at war
8. in the manner of at a trot
9. because of; in response to terrified at the sight, to smile at a remark
10. according to at his discretion
11. with reference to good at tennis
12. in the amount or number, to the degree, for the price, etc. of at twenty miles per hour, at five cents each
13. from an interval or distance of visible at half a mile, at arm's length
14. 1. occurring on the hour, minute, etc. of at five fifteen
    2. being of the age of at sixty-five
15. during the period of it happened at night

Etymology: ME < OE æt; akin to Goth, OS, ON at & L ad at, in, to

noun pl. at

Etymology: Thai

1. airtight
2. atomic