- consisting of or involving direct individual competition, confrontation, or communication; person-to-person: a one-on-one discussion.
- in direct encounter: I’d rather settle this with her one-on-one.
- a meeting or confrontation between two persons.
- go one-on-one with, Sports. to play directly against (an opposing player).
- denoting a relationship or encounter in which someone is involved with only one other persona one-on-one meeting