ACE

Definition

1. adjective of the highest quality. — synonyms: A-one, crack, first-rate, super, tiptop, topnotch, top-notch, tops(p)
2. verb succeed at easily. — synonyms: breeze_through, pass_with_flying_colors, sweep_through, sail_through, nail
3. verb score an ace against.
4. verb play (a hole) in one stroke.
5. verb serve an ace against (someone).
6. noun the smallest whole number or a numeral representing this number. — synonyms: one, 1, I, single, unity
7. noun one of four playing cards in a deck having a single pip on its face.
8. noun someone who is dazzlingly skilled in any field. — synonyms: adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot
9. noun proteolytic enzyme that converts angiotensin I into angiotensin II. — synonyms: angiotensin_converting_enzyme, angiotensin-converting_enzyme
10. noun a major strategic headquarters of NATO. — synonyms: Allied_Command_Europe
11. noun a serve that the receiver is unable to reach.