an
/ən/
article
- Used before words that begin with a vowel sound to indicate a non-specific item or person.
- It was an unexpected surprise.
- He is an honest person.
- She ate an apple for a snack.
preposition
- In or for each; per (used with rates or measurements).
- We eat out once an month.
- The car was traveling at 60 miles an hour.
- The job pays $20 an hour.