From The Collaborative International Dictionary of English v.0.48:
Quint \Quint\, n. [F. quinte, fr. L. quintus, quinta, the fifth,
quinque five. See Five.]
1. A set or sequence of five, as in piquet.
[1913 Webster]
2. (Mus.) The interval of a fifth.
[1913 Webster]
3. one of a set of quintuplets. [informal]
[PJC]