- Music.
- A composition for eight voices or eight instruments.
- A group of eight singers or eight instrumentalists.
- A group of eight: "A train of heavy wagons rumbled north on the Winnipeg Trail, drawn by octets of oxen" (Garrison Keillor).
- See octave (sense ).
- A set of eight valence electrons in an atom or ion, forming a stable configuration.
[Alteration (influenced by OCTO-DUET) of Italian ottetto, from otto, eight, from Latin octō.]





