(n)one, 1, I, ace, single, unitythe 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”
(s)matchless, nonpareil, one, one and only, peerless, unmatched, unmatchable, unrivaled, unrivalledeminent beyond or above comparison“matchless beauty”, “the team's nonpareil center fielder”, “she's one girl in a million”, “the one and only Muhammad Ali”, “a peerless scholar”, “infamy unmatched in the Western world”, “wrote with unmatchable clarity”, “unrivaled mastery of her art”