(management) Describing a service operation at which all of a customer's needs may be satisfied by a single server, without waiting in a second queue.

A friend or date whom one brings along to an event; a guest of a guest.

Alternative spelling of plus one

(colloquial) Something important; (with 'the') the most important one, (especially sports) the big game, the big play. / (US, colloquial) One hundred or one thousand dollars. / (US, colloquial) A dollar.

(idiomatic, derogatory) Subject to one's demands because of bribery.

Third-person singular simple present indicative form of one up

plural of one up

A final drink before one leaves.

(informal) in one attempt

plural of one-off