"quartet" in the noun sense
1. four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe
the cardinal number that is the sum of three and one
2. quartet, quartette
four performers or singers who perform together
3. quartet, quartette, quadruplet, quadruple
a set of four similar things considered as a unit
4. quartet, quartette, foursome
four people considered as a unit
"he joined a barbershop quartet"
"the foursome teed off before 9 a.m."
5. quartet, quartette
a musical composition for four performers
Source: WordNet® (An amazing lexical database of English)
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