Open English Wordnet
Nouns
(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” (n)onea single person or thing“he is the best one”,
“this is the one I ordered” Adjectives
(s)one, 1, i, aneused of a single unit or thing; not two or more“‘ane’ is Scottish” (s)one, unitaryhaving the indivisible character of a unit“a unitary action”,
“spoke with one voice” (s)oneof the same kind or quality“two animals of one species” (s)one, right(informal) very; used informally as an intensifier“that is one fine dog”,
“a right fine day” (s)oneindefinite in time or position“he will come one day”,
“one place or another” (s)onebeing a single entity made by combining separate components“three chemicals combining into one solution” (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”