at
//æt//
Preposition
1
expressing location or arrival in a particular place or position
I'll meet you at the station.
2
expressing the time when an event takes place
The meeting starts at 3 o'clock.
3
expressing a particular state or condition
The two countries are at war.
4
expressing a value, rate, or point on a scale
The car was traveling at 100 kilometers per hour.
5
expressing the object of a look, gesture, thought, action, or plan
She smiled at me.
6
expressing the means by which something is done
They were sold at auction.