WordNet (r) 3.0 (2006):

sextette
    n 1: six performers or singers who perform together [syn:
         sextet, sextette, sestet]
    2: a set of six similar things considered as a unit [syn:
       sextet, sextette, sestet]
    3: six people considered as a unit [syn: sextet, sextette,
       sixsome]
    4: a musical composition written for six performers [syn:
       sextet, sextette, sestet]