a company of eight singers or musicians.
a musical composition for eight voices or instruments.
Prosody, octave ( def 4 ).
any group of eight.
Also, octette.

1860–65; oct- + -et, as in duet

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World English Dictionary
octet (ɒkˈtɛt)
1.  any group of eight, esp eight singers or musicians
2.  a piece of music composed for such a group
3.  prosody another word for octave
4.  chem a group of eight electrons forming a stable shell in an atom
[C19: from Latin octo eight, on the model of duet]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Computing Dictionary

octet definition

jargon, networking
Eight bits. This term is used in networking, in preference to byte, because some systems use the term "byte" for things that are not 8 bits long.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica


in chemistry, the eight-electron arrangement in the outer electron shell of the noble-gas atoms. This structure is held responsible for the relative inertness of the noble gases and the chemical behaviour of certain other elements. The chemical elements with atomic numbers close to those of the noble-gas elements tend to combine with other such elements by losing, gaining, or sharing electrons; as a result of these processes their atoms attain the eight-outer-electron configuration of the noble-gas atoms. This observation, published in separate papers (1916) by the German chemist Walther Kossel and the American chemist Gilbert Newton Lewis, is known as the rule of eight, or octet rule, and is used to determine the valence, or combining capacity, of several chemical elements.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
As long as the outer orbitals form a full octet around its nucleus, chemical nirvana is within reach.
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