sex ‧ tet /seksˈtet/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Origin: sestet 'sextet' (19-21 centuries) , from Italian sestetto , from Latin sextus 'sixth' ; influenced by Latin sex 'six' ]
1 . a group of six singers or musicians performing together
2 . a piece of music for six performers:
Mozart’s sextet in B flat