one and only(s = adj.all) matchless, nonpareil, one, peerless, unmatchable, unmatched, unrivaled, unrivalled - eminent 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"

N  identity, sameness, coincidence, coalescence, convertibility, equality, selfness, self, oneself, identification, monotony, tautology, facsimile, homoousia: alter ego, ipsissima verba, same, self, very, one and the same, very thing, actual thing, real McCoy, no other, one and only, in the flesh, identical, self, ilk, the same, selfsame, one and the same, homoousian, coincide, coalescent, coalescing, indistinguishable, one, equivalent, tweedle dee and tweedle dum, much the same, of a muchness, unaltered, identically, on all fours.

as one, at one, at one time, beneath one, beyond one, fast one, for each one, for one, for one thing, from each one, go one better, hundred and one, in name only, in one case, in one ear, loved one, naked as the day one was born, not only, number one, number one wood, on one hand, on the one hand, one, one after another, one and all, one at a time, one by one, one c, one dollar bill, one horse, one hundred, one hundred eighty, one hundred fifteen, one hundred fifty, one hundred fifty-five, one hundred five, one hundred forty, one hundred forty-five, one hundred ninety, one hundred one, one hundred seventy, one hundred seventy-five, one hundred sixty, one hundred sixty-five, one hundred ten, one hundred thirty, one hundred thirty-five, one hundred twenty, one hundred twenty-five, one iron, one million million, one million million million, one of the boys, one of these days, one one's coattails, one percent, one piece, one shot, one sided, one thousand, one thousand million, one thousand thousand, one time, one upmanship, only, only if, only too, only when, pull a fast one, pull a fast one on, put one across, put one over, rolled into one, six of one and half a dozen of, square one, standing room only, thousand and one nights, to each one, to one ear, young one