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From The Collaborative International Dictionary of English v.0.48:
Quartet \Quar*tet"\, Quartette \Quar*tette"\, n. [It. quartetto, dim. of quarto the fourth, a fourth part, fr. L. quartus the fourth. See Quart.] 1. (Mus.) (a) A composition in four parts, each performed by a single voice or instrument. (b) The set of four person who perform a piece of music in four parts. [1913 Webster] 2. (Poet.) A stanza of four lines. [1913 Webster]