Verb

1. serve an ace against (someone)
2. play (a hole) in one stroke
3. score an ace against
4. succeed at easily

Noun

1. a serve that the receiver is unable to reach
2. one of four playing cards in a deck having a single pip on its face
3. a major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey
4. someone who is dazzlingly skilled in any field
5. the smallest whole number or a numeral representing this number

Adjective

1. of the highest quality