n An occasion when a performer or team of them (especially in vaudeville) expects to perform at a theater for a single evening.
n (idiomatic) A single sexualencounter between two individuals, where at least one of the parties has no immediate intention or expectation of establishing a longer-term sexual or romanticrelationship. As the phrase implies, the relationship lasts for only one night.
n (idiomatic) A person with whom one shares a single sexualencounter.