0 a playing card that has only one symbol on it -- das Ass
the ace of spades.
1 a person who is expert at anything -- ein Ass
He’s an ace with a rifle.
2 a serve in tennis in which the ball is not touched by the opposing player -- das Ass
3 the “one” on dominoes or dice. -- die Eins
4 very good -- super
The concert was ace.