Etymology: Middle English, from Old English æt; akin to Old High German az at, Latin ad
Date: before 12th century
1 —used as a function word to indicate presence or occurrence in, on, or near <staying at a hotel><at a party><sick at heart> 2 —used as a function word to indicate the goal of an indicated or implied action or motion <aim at the target><creditors are at him again> 3 —used as a function word to indicate that with which one is occupied or employed <at work><at the controls><good at chess> 4 —used as a function word to indicate situation in an active or passive state or condition <at liberty><at rest> 5 —used as a function word to indicate the means, cause, or manner <sold at auction><laughed at my joke><act at your own discretion> 6 a —used as a function word to indicate the rate, degree, or position in a scale or series <the temperature at 90><at first>b —used as a function word to indicate age or position in time <will retire at 65>