AtThe symbol for astatine.ATabbr.1. air temperature2. ampere-turn3. antitank4. automatic transmissionat (?t; ?t when unstressed)prep.1. a. In or near the area occupied by; in or near the location of: at the market; at our destination.b. In or near the position of: always at my side; at the center of the page.2. To or toward the direction or location of, especially for a specific purpose: Questions came at us from all sides.3. Present during; attending: at the dance.4. Within the interval or span of: at the dinner hour; at a glance.5. In the state or condition of: at peace with one’s conscience.6. In the activity or field of: skilled at playing chess; good at math.7. To or using the rate, extent, or amount of; to the point of: at 30 cents a pound; at high speed; at 20 paces; at 350°F.8. On, near, or by the time or age of: at three o’clock; at 72 years of age.9. On account of; because of: rejoice at a victory.10. By way of; through: exited at the rear gate.11. In accord with; following: at my request.12. Dependent upon: at the mercy of the court.13. Occupied with: at work.Idiom: at it Informal Engaged in verbal or physical conflict; arguing or fighting: The neighbors are at it again.[Middle English, from Old English æt; see ad- in Indo-European roots.]aTabbr. attoteslaAmerican Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.at (æt) prep1. used to indicate location or position: are they at the table?; staying at a small hotel. 2. towards; in the direction of: looking at television; throwing stones at windows. 3. used to indicate position in time: come at three o’clock. 4. engaged in; in a state of (being): children at play; stand at ease; he is at his most charming today. 5. (in expressions concerned with habitual activity) during the passing of (esp in the phrase at night): he used to work at night. 6. for; in exchange for: it’s selling at four pounds. 7. used to indicate the object of an emotion: angry at the driver; shocked at his behaviour. 8. where it’s at slang the real place of action[Old English æt; related to Old Norse at to, Latin ad to]at (??t; æt) n, pl at (Currencies) a Laotian monetary unit worth one hundredth of a kip[from Thai]at the internet domain name for (Computer Science) Austria At the chemical symbol for (Elements & Compounds) astatine symbol for (Units) Also: A ampere-turn AT abbreviation for (Education) attainment target Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014at1 (æt; unstressed ?t, ?t) prep. 1. (used to indicate a point or place occupied in space); in, on, or near: to stand at the door. 2. (used to indicate a location or position, as in time, on a scale, or in order): at age 65; at zero; at the end. 3. (used to indicate incidence or occurrence): at the sound of the bell; at low tide. 4. (used to indicate presence or location): at home; at hand. 5. (used to indicate amount, degree, or rate): at great speed; at high altitudes. 6. (used to indicate a direction, goal, or objective); toward: Look at that. 7. (used to indicate occupation or involvement): at work; at play. 8. (used to indicate a state or condition): at ease; at peace. 9. (used to indicate a cause or source): She was annoyed at their carelessness. 10. (used to indicate relative quality or value): at one’s best; at cost. [before 900; Middle English; Old English æt, c. Old Frisian et, Old Saxon, Old Norse, Gothic at, Old High German az, Latin ad] at2 (?t, æt) n., pl. at. a monetary unit of Laos, equal to 1/100 of a kip. [1950?55; At is used to talk about where something is or where something happens.You often use at to mean ‘next to’ or ‘beside’.You say that someone sits at a table or desk.If you want to mention the building where something is or where something happens, you usually use at.In British English, you say that someone is at school or at university when you want to say that they study there.Speakers of American English usually say that someone is in school.You say that something happens at a meeting, ceremony, or party.At is also used to say when something happens.You use at when you are mentioning a precise time.If you want to know the precise time when something happened or will happen, you can say ‘At what time…?’ but people usually say ‘What time…” or ‘When…?’You can say that something happened or will happen ‘at dawn’, ‘at dusk’, or ‘at night’.However, you say that something happened or will happen ‘in the morning’, ‘in the afternoon’, or ‘in the evening’.If something happens at a meal time, it happens while the meal is being eaten.You say that something happens at Christmas or at Easter.However, you say that something happens on a particular day during Christmas or Easter.In British English, at is usually used with weekend.American speakers usually use on or over with weekend.