#1 quartette n. [quartet] four performers or singers who perform together. wn
#2 quartette n. [quartet, quadruplet, quadruple] a set of four similar things considered as a unit. wn
#3 quartette n. [quartet, foursome] four people considered as a unit; "he joined a barbershop quartet"; "the foursome teed off before 9 a.m.". wn
#4 quartette n. [quartet] a musical composition for four performers. wn
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