Ace is a noun and meaning of ace generally refers to a playing card with a single spot on it. It is regarded as the highest card in a suit of 13 cards of a card deck.
Informally, the meaning of ace is very good or very skilled. It can be called the synonym of excellent.
Its other usage is in the sport Tennis.
In Tennis, meaning of ace is a very fast and strong serve that the opponent cannot hit back.
1. He got three aces in his share of cards.
2. He is an ace at chess.
3. Their new record is really an ace.
4. He lost the match due to the ace that his opponent got in the beginning.