one

first; one / same; one / a; some, a certain; one / Denotes something composed of many smaller parts single; one / Denotes a negative opinion to the listener held by the speaker; you! / only, merely Denotes speakers disappointment with the small size or amount

(colloquial) some man, some guy (undefined male person)

(colloquial) glass of vodka

twenty-one

(idiomatic) one and only

seventy-one

eighty-one

fifty-one

forty-one