WordWeb Online

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. [informal] Someone who is dazzlingly skilled in any field
   - adept, champion, sensation, maven [US, informal], mavin [US, informal], virtuoso, genius, hotshot [informal], star, superstar, whiz [informal], whizz [informal], wizard [informal], wiz [informal], megastar [informal]
    
4. A serve that the receiver is unable to reach

1. Easily do well at; pass perfectly
   "You will ace";
   - breeze through [informal], pass with flying colors [US], sweep through, sail through, nail [informal], 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, skill, etc.; very good or impressive
   "an ace reporter";
   - A-one [informal], crack [informal], first-rate, super, tiptop, topnotch [informal], top-notch [informal], tops [informal], A1 [informal], excellent, first-class, fantabulous [informal], splendid, ripping [Brit, informal], mean [informal], beezer [UK, archaic], lush [Brit, informal], stellar [informal], awesome [informal], brilliant, outstanding, top-drawer
    
2. Brilliant; very good
   - socko [N. Amer, informal], righteous [US, slang], fab [Brit, informal], crucial [slang], rad [N. Amer, slang], radical [N. Amer, slang], nang [Brit, slang], phat [slang], legit [US, slang], awesomesauce [informal], amazeballs [informal], beaut [Austral, NZ, informal], lit [US, slang], storming [Brit, informal], blinding [Brit, slang], stonking [Brit, informal], brill [Brit, informal], wicked [slang], cushty [Brit, informal], def [slang], magic [Brit, slang], smokin' [slang], smoking [slang], super [informal], sick [N. Amer, slang]

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: aces, acing, aced

See also: super-duper [informal], superior

Type of: digit, expert, figure, headquarters, 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, Texas