Ace

noun (1)

1. a die face marked with one spot
2. a playing card marked in its center with one pip
3. a domino end marked with one spot
4. a very small amount or degree : particle
5. a point scored especially on a service (as in tennis or handball) that an opponent fails to touch
6. a golf score of one stroke on a hole
7. a hole made in one strokealso
8. a combat pilot who has brought down at least five enemy airplanes
9. a person who excels at something
10. the best pitcher on a baseball team