Source : Webster's Revised Unabridged Dictionary (1913)

Octet \Oc*tet"\, n. [From L. octo eight, like E. duet, fr.L.
   duo. See {Octave}.] (Mus.)
   A composition for eight parts, usually for eight solo
   instruments or voices.

Source : WordNet®

octet
     n 1: the cardinal number that is the sum of seven and one [syn: {eight},
           {8}, {VIII}, {eighter}, {eighter from Decatur}, {octad},
           {ogdoad}, {octonary}]
     2: eight performers or singers who perform together [syn: {octette}]
     3: a set of eight similar things considered as a unit [syn: {octette}]
     4: eight people considered as a unit [syn: {octette}, {eightsome}]
     5: a musical composition written for eight performers [syn: {octette}]

Source : Free On-Line Dictionary of Computing

octet
     
         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.
     
        (1995-03-03)