1.  sextet(n = noun.communication) sestet, sextette - a musical composition written for six performers;
is a kind of composition, musical composition, opus, piece, piece of music

2.  sextet(n = noun.quantity) 6, captain hicks, half a dozen, hexad, sestet, sextuplet, sise, six, sixer, vi - the cardinal number that is the sum of five and one;
is a kind of digit, figure

3.  sextet(n = noun.group) sestet, sextette - six performers or singers who perform together;
is a kind of musical group, musical organisation, musical organization

4.  sextet(n = noun.group) sestet, sextette - a set of six similar things considered as a unit;
is a kind of set

5.  sextet(n = noun.group) sextette, sixsome - six people considered as a unit;
is a kind of assemblage, gathering

   See Sestet. [1913 Webster]

sextet, n. (also sextette)
1 Mus. a composition for six voices or instruments.
2 the performers of such a piece.
3 any group of six.

Etymology:
alt. of SESTET after L sex six