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1. The smallest whole number or a numeral representing this number
   "he has the ace but will need a two and three to go with it";
   - one, 1, I, single, unity
    
2. One of four playing cards in a deck having a single pip on its face
    
3. Someone who is dazzlingly skilled in any field
   - adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz, megastar
    
4. A serve that the receiver is unable to reach

1. Easily do well at; pass perfectly
   "You will ace";
   - breeze through, pass with flying colors [US], sweep through, sail through, nail, pass with flying colours [Brit, Cdn]
    
2. Score an ace against
   "He aced his opponents"
    
3. (golf) play (a hole) in one stroke
    
4. (tennis) serve an ace against (someone)

1. Of the highest quality
   "an ace reporter";
   - A-one, crack, first-rate, super, tiptop, topnotch, top-notch, tops
    
2. (informal) brilliant; very good
   - storming [Brit], blinding [Brit], stonking [Brit], brill [Brit], wicked, def, magic [Brit], smokin', smoking, super, sick [N. Amer]

1. A major strategic headquarters of NATO safeguarding an area extending from Norway to Turkey
   - Allied Command Europe
    
2. Proteolytic enzyme that converts angiotensin I into angiotensin II
   - angiotensin converting enzyme, angiotensin-converting enzyme

Derived forms: acing, aced, aces

See also: awesome [informal], beaut [Austral, NZ], excellent, fantabulous, first-class, splendid, superior, top-drawer

Type of: digit, expert, figure, headquarters, hit, make it, make the grade [N. Amer], pass, peptidase, play, playing card, protease, proteinase, proteolytic enzyme, rack up, score, serve, service, tally

Part of: NATO, North Atlantic Treaty Organisation [Brit], North Atlantic Treaty Organization

Encyclopedia: Ace, TX Ace, King, Queen Ace Ace, Texas Ace, the Bat-Hound Ace, The Bat Hound Ace, The Bat-Hound