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at1

[at; unstressed uh t, it]
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preposition
  1. (used to indicate a point or place occupied in space); in, on, or near: to stand at the door; at the bottom of the barrel.
  2. (used to indicate a location or position, as in time, on a scale, or in order): at zero; at noon; at age 65; at the end; at the lowest point.
  3. (used to indicate presence or location): at home; at hand.
  4. (used to indicate amount, degree, or rate): at great speed; at high altitudes.
  5. (used to indicate a direction, goal, or objective); toward: Aim at the mark. Look at that.
  6. (used to indicate occupation or involvement): at work; at play.
  7. (used to indicate a state or condition): at ease; at peace.
  8. (used to indicate a cause or source): She was annoyed at his stupidity.
  9. (used to indicate a method or manner): He spoke at length.
  10. (used to indicate relative quality or value): at one's best; at cost.
Idioms
  1. be at (someone), to be sexually aggressive toward (a person): She's pregnant again because he's at her morning, noon, and night.
  2. where it's at, Informal. the place where the most interesting or exciting things happen: Emma says that Rome is definitely where it's at now.

Origin of at1

before 900; Middle English; Old English æt; cognate with Old Frisian et, Old Norse, Old Saxon, Gothic at, Old High German az, Latin, Old Welsh, Old Breton ad, Greek a- (< a pre-Hellenic IE substratum language), Oscan, Old Irish, Gaulish, Phrygian ad-

at2

[aht, at]
noun
  1. a money of account of Laos, the 100th part of a kip.

Origin of at2

1950–55; < Lao; compare Thai ʔàt formerly, a copper coin worth one eighth of a füang, ultimately < Pali aṭṭha eight

aT

  1. attotesla.

At

  1. ampere-turn.

At

Symbol, Chemistry.
  1. astatine.

AT

  1. achievement test.
  2. antitank.

at-

  1. variant of ad- before t: attend.

at.

  1. atmosphere.
  2. atomic.
  3. attorney.

A.T.

  1. Atlantic time.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for at

at1

preposition
  1. used to indicate location or positionare they at the table?; staying at a small hotel
  2. towards; in the direction oflooking at television; throwing stones at windows
  3. used to indicate position in timecome 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 forit's selling at four pounds
  7. used to indicate the object of an emotionangry at the driver; shocked at his behaviour
  8. where it's at slang the real place of action

Word Origin

Old English æt; related to Old Norse at to, Latin ad to

at2

noun plural at
  1. a Laotian monetary unit worth one hundredth of a kip

Word Origin

from Thai

at3

the internet domain name for
  1. Austria

At

the chemical symbol for
  1. astatine
symbol for
  1. Also: A ampere-turn

AT

abbreviation for
  1. attainment target

at.

abbreviation for
  1. Also: atm atmosphere (unit of pressure)
  2. atomic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for at

prep.

Old English æt, from Proto-Germanic *at (cf. Old Norse, Gothic at, Old Frisian et, Old High German az), from PIE *ad- "to, near, at" (cf. Latin ad "to, toward" Sanskrit adhi "near;" see ad-).

Lost in German and Dutch, which use their equivalent of to; in Scandinavian, however, to has been lost and at fills its place. In choosing between at church, in church, etc. at is properly distinguished from in or on by involving some practical connection; a worshipper is at church; a tourist is in the church.

The colloquial use of at after where ("where it's at") is attested from 1859. At last is recorded from late 13c.; adverbial phrase at least was in use by 1775. At in Middle English was used freely with prepositions (e.g. at after, which is in Shakespeare), but this has faded with the exception of at about, which was used in modern times by Trollope, Virginia Woolfe, D.H. Lawrence, and Evelyn Waugh, but nonetheless is regarded as a sign of incompetent writing by my copy editor bosses.

at-

assimilated form of ad- "to, toward, before" before stems beginning in -t-; see ad-.

Online Etymology Dictionary, © 2010 Douglas Harper

at in Medicine

At

  1. The symbol for the elementastatine

at-

pref.
  1. Variant ofad-

at in Science

At

  1. The symbol for astatine.

astatine

[ăstə-tēn′]
At
  1. A highly unstable, rare, radioactive element that is the heaviest of the halogen elements. Its most stable isotope has a half-life of 8.3 hours. Atomic number 85; melting point 302°C; boiling point 337°C; valence probably 1, 3, 5, 7. See Periodic Table.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.