ace
US /eɪs/
UK /eɪs/

1.
a playing card with a single spot on it, ranked as the highest card in its suit in most card games
:
•
He drew an ace of spades.
•
The ace is the most powerful card in this game.
1.
to perform extremely well in an examination or other test
:
•
She aced her final exams.
•
He aced the interview and got the job.
1.
excellent
:
•
That was an ace shot!
•
We had an ace time at the party.