noun (n)

• the cardinal number that is the sum of one and one and one(noun.quantity)

  Synonym:
  3, deuce-ace, iii, leash, tercet, ternary, ternion, terzetto, three, threesome, tierce, trey, triad, trine, trinity, triplet, troika
  

  source: wordnet30
• a musical composition for three performers(noun.communication)

  source: wordnet30
• three performers or singers who perform together(noun.group)

  source: wordnet30
• a set of three similar things considered as a unit(noun.group)

  Synonym:
  triad, triple, triplet
  

  source: wordnet30
• three people considered as a unit(noun.group)

  Synonym:
  threesome, triad, trinity
  

  source: wordnet30
• Three, considered collectively; three in company or acting together; a set of three; three united.(noun)

  source: webster1913