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Noun: triad  'trI,ad
  1. The cardinal number that is the sum of one and one and one
    - three, 3, III, trio, threesome, tierce, leash, troika, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-ace
  2. A set of three similar things considered as a unit
    - trio, triplet, triple
  3. Three people considered as a unit
    - trio, threesome, trinity
  4. A three-note major or minor chord; a note and its third and fifth tones
    - common chord
  5. A Chinese society or gang involved in organized crime

Derived forms: triads

Type of: assemblage, chord, digit, figure, gathering, set

Encyclopedia: Triad