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Definition of ace : 1. A single point won by a stroke, as in handball, rackets, etc.; in tennis, frequently, a point won by a service stroke.
2. A unit; a single point or spot on a card or die; the card or die so marked; as, the ace of diamonds.
3. Hence: A very small quantity or degree; a particle; an atom; a jot.

Synonyms:

sense datum, iodin, superstar, wizard, nab, blast, collar, card, cop, single, headliner, paladin, star, professional, pull off, cushdy, advantage, nail, champion, oneness, whiz, face card, experienced, aesthesis, proficient, singular, authority, esthesis, great, dab, backswing, diamond, 1, heart, asterisk, maestro, accomplished, integrity, bring off, whizz, triumph, principal, sorcerer, hotshot, pick up, smash, sense experience, accomplish, clay, a-one, gifted, expert, exponent, wizardry, be able to do something, sentience, admirer, bogie, adept, artist, crack, prodigy, terrific, iodine, sense, nail down, the Davis Cup, good, sensory faculty, breeze through, capable, complete, birdie, house of cards, wholeness, master, versed, masterly, brainiac, thaumaturgist, sentiency, topnotch, professed, sweep through, star topology, masterful, maven, thaumaturge, brain, caddy, tiptop, club, educated, achieve, arrest, old hand, bogey, best, first-rate, angiotensin-converting enzyme, superman, deuce, lead, peg, deck, flair, fighter, protagonist, friend, sensation, past master, mavin, mastermind, transliterate, super, skilled, supporter, jack, veteran, brilliance, necromancer, crackerjack, hero, ball girl, unity, booster, practiced, i, champ, come together, virtuoso, consummate, skillful, alley, succeed, break, sail through, pinpoint, one, manage, pass with flying colors, bunker, bingle, break point, attain, ability, dab hand, plum, tops, sense impression, title-holder, phat, genius, compleat, ball boy, boom, apprehend, magician, wiz, atomic number 53, queen

excellent (part of speech: adjective)

all-star, A-1, exemplary, classic, fine, exquisite, superior, prime, above par, choice, select, superlative, A plus, excellent, splendid

expert (part of speech: adjective)

distinguished, able, outstanding

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