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From The Collaborative International Dictionary of English v.0.48:
octet \oc*tet"\, n. [From L. octo eight, like E. duet, fr.L. duo. See Octave.] 1. (Mus.) A composition for eight parts, usually for eight solo instruments or voices. [1913 Webster] 2. A group of eight singers or eight musicians. [PJC]