1. The cardinal number that is the sum of three and one (synset 113766444)
  2. Four performers or singers who perform together (synset 108264172)
  3. A set of four similar things considered as a unit (synset 108004531)
  4. Four people considered as a unit (synset 108003822)
    "he joined a barbershop quartet"; "the foursome teed off before 9 a.m."
  5. A musical composition for four performers (synset 107055434)

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