1. (noun) one, 1, I, ace, single, unity
the smallest whole number or a numeral representing this number
"he has the one but will need a two and three to go with it"; "they had lunch at one"
2. (noun) ace
one of four playing cards in a deck having a single pip on its face
3. (noun) ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz
someone who is dazzlingly skilled in any field
4. (noun) angiotensin converting enzyme, angiotensin-converting enzyme, ACE
proteolytic enzyme that converts angiotensin I into angiotensin II
5. (noun) Allied Command Europe, ACE
a major strategic headquarters of NATO; safeguards an area extending from Norway to Turkey
6. (adj) ace
a serve that the receiver is unable to reach
7. (verb) ace, A-one, crack, first-rate, super, tiptop, topnotch, top-notch, tops(p)
of the highest quality
"an ace reporter"; "a crack shot"; "a first-rate golfer"; "a super party"; "played top-notch tennis"; "an athlete in tiptop condition"; "she is absolutely tops"
8. (verb) breeze through, ace, pass with flying colors, sweep through, sail through, nail
succeed at easily
"She sailed through her exams"; "You will pass with flying colors"; "She nailed her astrophysics course"
9. (verb) ace
score an ace against
"He aced his opponents"
10. (verb) ace
play (a hole) in one stroke
11. (verb) ace
serve an ace against (someone)
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Definition of 'ace' 
