at (EN)
preposition, noun

preposition “at”

at
  1. located in or very close to a specific place
    We met at the coffee shop.
  2. happening at a specific moment
    The meeting starts at 9 a.m.
  3. aimed in the direction of something or someone, sometimes aggressively
    She pointed at the sign.
  4. offered or sold for a specified price
    I bought the chair at $50.
  5. engaged in a particular activity
    I'm at lunch, can I call you back?
  6. experiencing a particular condition or situation
    He's at peace now.
  7. at a specific point within a range or sequence
    The stock is trading at $20 per share.
  8. because of
    She was surprised at the news.
  9. using a particular way or approach to do something
    She grabbed him at the collar.
  10. holding a given speed or rate
    The car was moving at a speed of 60 miles per hour.
  11. concerning or with respect to a particular subject or skill
    I'm really good at math.

noun “at”

sg. at, pl. ats
  1. the symbol used in email addresses and to denote 'at' in commercial contexts
    My email address is jane.doe at example dot com.