AT

verb

1. 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)

noun

1. The at sign (@).

preposition

1. In, near, or in the general vicinity of a particular place.
2. (indicating time) Indicating occurrence in an instant of time or a period of time relatively short in context or from the speaker's perspective.
3. In the direction of (often in an unfocused or uncaring manner).