At  prep. 1 expressing position (wait at the corner; at school). 2 expressing a point in time (at dawn). 3 expressing a point in a scale (at his best). 4 expressing engagement in an activity etc. (at war). 5 expressing a value or rate (sell at £10 each). 6 a with or with reference to (annoyed at losing; came at a run). B by means of (starts at a touch). 7 expressing motion or aim towards (aim at the target; laughed at us).  at all see *all. At hand see *hand. At home see *home. At it engaged in an activity; working hard. At once see *once. At that 1 moreover (a good one at that). 2 then (at that he left). At times see *time. [old english]