used to indicate position in or movement towards a place
at the station
used to indicate a time
at midnight
used to indicate a rate or value
estimated at 5,000
used to express the object of an action
Look at them!
used to indicate a state
at risk
used to indicate presence or occurrence in, on, or near a place
stops at Derby
used to indicate the direction of an action or motion
smiled at me
aim at the target
used to indicate the time when something happens
starts at nine
at weekends
used to indicate position in front of or facing something
sitting at the table
used to indicate occupation or employment
at the controls
used in indicating level of competence in any activity
an expert at chess
used to indicate a situation or condition
at risk
used to indicate response or reaction
laughs at their jokes
used to indicate position on a scale, e.g. of cost, speed, or age
driving at 90 mph
used with certain verbs of violence to indicate superficial or incomplete effect
clawing and tearing at the ferns — John Steinbeck
using no more than a single effort, occasion etc
He ran up the stairs two at a time
busy doing something
I've been hard at it all day
used to emphasize some striking aspect; too
got a bonus, and a large one at that
in reaction to something just said or done
At that they walked out
just there, without attempting to investigate, etc further
let it go at that
see where2