1. a brief sexual encounter lasting only for a single night; - Example: "he ran through a series of loveless one-night stands"
2. a performance in one place on one night only;
WordNet (r) 3.0 (2006):
one-night stand
n 1: a brief sexual encounter lasting only for a single night;
"he ran through a series of loveless one-night stands"
2: a performance in one place on one night only