weak [ət] , strong [æt]preposition1) in a place in a particular placeI'll meet you at the main entrance.[/ex]Does this train stop at Newport?[/ex]We live at 23 Brookfield Avenue.[/ex]Trevor's at the doctor's – he'll be back soon.[/ex]I'm babysitting at Sally's (= at Sally's house) tomorrow night.[/ex]He wants to spend more time at home with his family.[/ex]Dad should be at work by now.[/ex]2) near sth sitting or standing close to somethingShe was standing at the window, staring out.[/ex]Why isn't he at his desk?[/ex]3) used for saying when sth happens used for saying what time something happens, or someone's age when something happensThe match starts at three o'clock.[/ex]What are you doing at the weekend?[/ex]At night temperatures sometimes fall to 30 degrees below zero.[/ex]Mozart was already composing music at the age of five.[/ex]4) during a process in a particular part of a process or series of eventsHe dies right at the start of the film.[/ex]At some point things started to go wrong.[/ex]5) doing sth taking part in an activity, or involved in a situationWe were at a party last night when you called.[/ex]Has Karen graduated, or is she still at college?[/ex]6) used for talking about reactions used for stating what causes a particular reactionAudiences still laugh at his jokes.[/ex]She was annoyed at being interrupted.[/ex]7) used with levels and amounts used for showing the level of prices, temperatures, speeds etcHis Ferrari crashed at 120 miles an hour.[/ex]The plastic pipes will melt at high temperatures.[/ex]8) in a particular direction used for saying where an action such as looking, pointing, or hitting is directedWhy are you staring at me like that?[/ex]She swung her bat at the ball, but missed.[/ex]9) used for talking about abilities used for saying which skills or abilities someone has or does not haveI've never been very good at sports.[/ex]He is an expert at getting what he wants.[/ex]•at all — used for emphasis when you are saying or asking whether something is even slightly true[/ex]Has the situation improved at all?[/ex]Don't you have any money at all?[/ex]He knows nothing at all about computers.[/ex]at sth's best/worst/strongest etc — showing the best/worst etc qualities of something[/ex]This is British cooking at its best.[/ex]
Dictionary for writing and speaking English. 2014.