A2 one person or thing in a group: One of our daughters has just got married.
A2 at a particular time in the past: I first met him one day in the park.
› used to refer to a time in the future that is not yet decided: We should have a drink together one evening.
one or two B1 a few: I’d like to make one or two suggestions.
› used when saying there is no other person or thing: He’s the one person who never forgets my birthday.
› a single thing: I think we should paint the bedroom all one color.