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• at
  at

  preposition

  (used to indicate a point or place occupied in space); in, on, or near.
• At
  At

  abbreviation

  ampere-turn.
• AT
  AT

  abbreviation

  achievement test.
• aT
  aT

  abbreviation

  attotesla.
• at-
  at-

  variant of ad- before t: attend.
• at.
  at.

  abbreviation

  atmosphere.
• A.T.
  A.T.

  abbreviation

  Atlantic time.

at

¹ American  

[at, uht, it] / æt, ət, ɪt /

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.

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noun

1. @, a symbol that is used in email addresses to link a username to a domain name, used at the beginning of Twitter handles, and in other identifying designations on the internet.

verb (used with object)

@ed, at-ed, @ing, at-ing

1. (on social media)

   1. to tag an account that begins with the symbol @, resulting in a link to that account’s profile and a notification to the user that their account has been explicitly mentioned in someone else’s post.

      One big celebrity at-ed the restaurant, and suddenly reservations were booked for the next six weeks.

   2. to include or involve someone, or to call a person out, especially when that person does not want to be involved or singled out.

      My opinions are my own, so please don’t at my employer about the stuff I write on this site.

   3. to argue with someone, or dispute someone’s stated views, especially on social media.

      The sequel was better than the original—don’t at me!

idioms

1. where it's at, the place where the most interesting or exciting things happen.

   Emma says that Rome is definitely where it's at now.

2. be at (someone), to be sexually aggressive toward (a person).

   She's pregnant again because he's at her morning, noon, and night.

at ² American  

[aht, at] / ɑt, æt /

Or att

noun

• at,
  plural
• ats
  plural

1. a money of account of Laos, one 100th of a kip.

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At ³ American  

abbreviation

1. ampere-turn.

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At ⁴ American  

Symbol, Chemistry.

1. astatine.

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AT ⁵ American  

abbreviation

1. achievement test.

2. antitank.

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aT ⁶ American  

abbreviation

1. attotesla.

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at- ⁷ American  

1. variant of ad- before t: attend.

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at. ⁸ American  

abbreviation

1. atmosphere.

2. atomic.

3. attorney.

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A.T. ⁹ American  

abbreviation

1. Atlantic time.

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at ¹ British  

/ æt /

preposition

1. 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. slang the real place of action

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At ² British  

symbol

1. astatine

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symbol

1. Also: A. ampere-turn

at. ³ British  

abbreviation

1. Also: atm. atmosphere (unit of pressure)

2. atomic

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AT ⁴ British  

abbreviation

1. attainment target

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at ⁵ British  

/ ɑːt, æt /

noun

1. a Laotian monetary unit worth one hundredth of a kip

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at ⁶ British  

abbreviation

1. Austria

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Other Word Forms

Noun Inflected Forms

• at
  plural
• ats
  plural

Etymology

Origin of at¹

First recorded 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, Oscan ad-, Umbrian ař-, Old Irish, Gaulish, Phrygian ad-

Origin of at²

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

Example Sentences

See Examples For:

at At AT aT at- at. A.T. ats @ed @ing

In 2009, Brent Seales at the University of Kentucky became the first researcher to make micro-CT scans of a Herculaneum scroll, one belonging to the Institut de France.

From Science Daily ● Sep. 26, 2026

Through contacts at the Space Sciences Laboratory, he connected with Jake LaManna, a physicist at the Center for Neutron Research at the National Institute of Standards and Technology in Gaithersburg, Maryland.

From Science Daily ● Sep. 26, 2026

These compounds are often present at very low concentrations, and their chemical structures can vary enormously.

From Science Daily ● Sep. 26, 2026

She currently translates Greek and Egyptian writing preserved on ancient papyri at UC Berkeley's Center for the Tebtunis Papyri in the Bancroft Library.

From Science Daily ● Sep. 26, 2026

The final number is estimated at more than two hundred thousand.

From "At Last She Stood" by Erin Entrada Kelly

At the same time, Thiagarajan and Eiler had recently finished research measuring isotope ratios in natural gases.

From Science Daily ● Sep. 26, 2026

At a pop-up event, A24 sold “Primetime” merch featuring another Hansen quote: “What would’ve happened if I wasn’t here?”

From Salon ● Sep. 26, 2026

At this age, young adolescents’ brains are being wired to build relationships, so the risks compound.

From The Wall Street Journal ● Sep. 26, 2026

At least 18 states require economics for graduation, although some states like Texas and California replaced economics requirements with personal finance.

From MarketWatch ● Sep. 26, 2026

At the terminal on the far end, signals are converted back into chemical messengers, called neurotransmitters, for the short voyage across the synapse to the dendrites of the next neuron.

From "Phineas Gage" by John Fleischman

"After AI and tech sentiment had dominated market moves over the last couple of weeks, investors are now forced to move back to focusing on geopolitical tensions," AT Global Markets' Nick Twidale said.

From Barron's ● Jul. 8, 2026

In addition, AT Umbrella, which owns the operating subsidiaries, issued $350 million of promissory notes to the same insiders concurrent with the IPO, effectively another payout to them.

From The Wall Street Journal ● Dec. 29, 2025

The event, named AT 2024tvd, exhibited the fastest-changing radio emission ever recorded from a black hole consuming a star.

From Science Daily ● Oct. 16, 2025

It's not straightforward, as not all social media firms support the same protocol, for example, BlueSky uses the AT Protocol.

From BBC ● Mar. 27, 2025

I followed the side trail up and under heavily bowed limbs to where it rejoined the AT.

From "A Walk in the Woods" by Bill Bryson

We write aT to denote the tangential component and aN to denote the normal component.

From Textbooks ● Mar. 30, 2016

Find aT and aN at time t = −3.

From Textbooks ● Mar. 30, 2016

Find aT and aN as functions of t.

From Textbooks ● Mar. 30, 2016

The tangential and normal components of acceleration aT and aN are the projections of the acceleration vector onto the unit tangent and unit normal vectors to the curve.

From Textbooks ● Mar. 30, 2016

Put together some good at- bats, but we weren’t quite able to finish it,” Padres starter Seth Lugo said.

From Washington Times ● Jul. 17, 2023

Ehire Adrianza lined out to left before Floro struck out Grissom in a 13-pitch at- bat for his 10th save.

From Seattle Times ● Oct. 5, 2022

Joc Pederson contributed two hits and is seven for his last 13 at- bats.

From Los Angeles Times ● May 28, 2015

All New York Times executives are at- will employees.

From Reuters ● Aug. 17, 2012

It appears as a-, ab-, ac-, ad-, af-, ag-, al-, an-, ap-, ar-, as-, at-, as in achieve, abbreviate, accede, admire, affix, aggregate, allot, annex, approve, arrive, assign, attract.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

"I don't do this as a joke. I do this because it's what I'm good at. I'm going to prove it this year and keep proving it moving forward."

From BBC ● Jun. 1, 2026

"The smell is awful, very pungent. It is also unpleasant to look at. It looks filthy," said Nurhasanah, who like many Indonesians only has one name.

From Barron's ● Feb. 17, 2026

“If you don’t follow the scouting report and take away what they’re good at, they’re going to do what they’re good at. We let that happen a few too many times tonight.”

From Los Angeles Times ● Jan. 22, 2026

“That’s the thing that I’m good at. That’s the thing that I’ve trained to do,” Mescal says.

From The Wall Street Journal ● Jan. 20, 2026

“Mr. Davis has not been to see me or any of my people,” he said, “and any figures he has given he has jumped at. He knows nothing about the matter.”

From "The Devil in the White City" by Erik Larson

“The president or protectee is never exposed to the outside,” said A.T.

From The Wall Street Journal ● Apr. 27, 2026

The blocked punt set up Carr’s 35-yard touchdown pass to A.T.

From Los Angeles Times ● Dec. 21, 2023

That’s why Clawson has confidence despite losing a talent like two-time 1,000-yard receiver A.T.

From Washington Times ● Aug. 16, 2023

Bridging climate fiction with a focus on the politics of health and disability, A.T.

From Slate ● Dec. 30, 2022

A.T. was his chem lab partner this past semester.

From "Dear Martin" by Nic Stone

Men waved their ats and umbrellas, ladies, of whom there were many hundreds present, waved their handkerchiefs, and men, strangers to each other, shook hands with the fervency of brotherhood.

From The Works of Robert G. Ingersoll, Vol. 8 (of 12) Dresden Edition?Political by Robert Green Ingersoll

Work or do, to, chai; I work, ats chái or cháit-sen; thou workest, nuk'w chái or chái-uts-hu; he works, kw'sá chai; we work, nung'l tsá-chái; ye work, nuk'w't-sa ái-a-chái; they work, tsâ-tsa chi´chai.

From Alphabetical Vocabularies of the Clallum and Lummi by George Gibbs

The little children scattered calico flowers on their path, the snowy-aired old men with red faces and rinkles took off their brown paper ats to slewt the noble Marcus.

From Burlesques by William Makepeace Thackeray

Sho sez at high class ats laid dahn all th’ brass,    Just nah they’re beginnin ta craw; To mak up for th’ trouble they’re bahn to charge double,    For bad speckulashun it law.

From Random Rhymes and Rambles by William Aldis Wright

Pronouns: I, absolute, ut´za; copulative, prefixed to a verb, ats; suffixed to do., sun, sen, sin.

From Alphabetical Vocabularies of the Clallum and Lummi by George Gibbs

But she also did it on Twitter and @ed Powers.

From Los Angeles Times ● Sep. 6, 2019

You’ll be able to search for files you have stored in the cloud by @ing them.

From The Verge ● May 18, 2022

The system of followers, @ing and threading encourages sprawling conversations to develop from initial tweets, favouring constant interaction.

From The Guardian ● Aug. 23, 2019

Relieve yourself of this outrageous expectation, and stop @ing famous people who don’t know you if it’s going to get you all steamed up when they continue living their lives without you in it.

From Slate ● May 2, 2016