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say it: wuhn
one is an adjective and noun meaning "used of a single unit or thing; not two or more". It carries 9 recorded senses.
(informal) very; used informally as an intensifier
“that is one fine dog”
“a right fine day”
colloquialism
being a single entity made by combining separate components
“three chemicals combining into one solution”
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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for one come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.