at

In, near, or in the general vicinity of (a particular place).

Caesar was at Rome.

A climate treaty was signed at Kyoto in 1997.

I was at Jim’s house at the corner of Fourth Street and Vine.

at the bottom of the page; sitting at the table; at church; at sea

Hirtius and Pansa, who were good men and admirers of Cicero, begged him not to desert them, and undertook to put down Antony if Cicero would remain at Rome.

Today my friend Marsha is at her friend’s house.

Present or taking place during (an event).

Was he at the meeting?

There was a big fight at the class reunion.

Indicating time of occurrence, especially an instant of time, or a period of time relatively short in context or from the speaker’s perspective.

at six o’clock; at dawn; at closing time; at the age of twelve; at night; at the moment

Hi, Anne. Are you busy? — Hi, Anna. Yes. At 10 a.m. I am writing.

In the direction of; towards; (often implied to be in a hostile or careless manner).

Don’t just talk at someone; really listen to what they have to say.

Stones were thrown at us, but we couldn't see who did.

He shouted at her.

She pointed at the curious animal.

Indicating action bearing upon something, especially continued or repeated action.

Don't pick at your food!

My cat keeps scratching at the furniture.

I was working at the problem all day.

In response or reaction to.

At my request, they agreed to move us to another hotel.

He jumped at the sudden noise.

We laughed at the joke.

She was mad at their comments.

Occupied in (activity).

men at work; children at play

In a state of.

The two countries are at war.

She is at sixes and sevens with him.

They are at loggerheads over how best to tackle the fiscal cliff.

Subject to.

We hope that the event will go ahead, but we are at the whim of the weather.

The city was at the mercy of the occupying forces.

Denotes a price.

3 apples at 2¢ (each)

The offer was at $30,000 before negotiations.

Indicates a position on a scale or in a series.

Sell at $90.

Tiger finished the round at tenth, seven strokes behind the leaders.

I’m offering it—just to select customers—at cost.

The river is at its highest in spring.

These babies weigh in at ten tons apiece.

at best; at most; at worst; at least

In certain phrases, used to indicate the manner in which something happens or is done.

The car came towards me at speed.

He spoke at great length on the topic.

The winner will be chosen at random.

The at sign (@).

(alt of, alternative)Alternative form of att (Laos currency unit)

(form of, informal, neologism, rare)Rare form of @; to reply to or talk to someone, either online or face-to-face. (from the practice of targeting a message or reply to someone online by writing @name)

(Northern England, alt of, alternative, obsolete, possibly, rare)(Northern England, rare, possibly obsolete) Alternative form of 'at (relative pronoun; reduced form of “that” and/or “what”).

Tak us t’ foxes, t’ little foxes at spoils t’ veynes: fer our veynes hev tender grapes.