Definitions

1. preposition

in or to a specified place, direction, or position

“She’s standing at the door.”

2. adverb

used to indicate a time or point in time

“The concert starts at midnight.”

3. prefix

used in combination with a verb or a noun to form words related to time or place

“attractive, atmosphere”

4. noun

a point in time or space

“The meeting is at 2 PM, and I’m running late.”

5. conjunction

used to indicate a relationship between two events or states

“I’ll be there at 5 PM if you’re free then.”