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3 definitions found
 for triad
From The Collaborative International Dictionary of English v.0.48 :

  Triad \Tri"ad\, n. [L. trias, -adis, Gr. ?, ?, fr.?, ?, three:
     cf. F. triade. See Three, and cf. Trias, Trio.]
     1. A union of three; three objects treated as one; a ternary;
        a trinity; as, a triad of deities.
        [1913 Webster]
     2. (Mus.)
        (a) A chord of three notes.
        (b) The common chord, consisting of a tone with its third
            and fifth, with or without the octave.
            [1913 Webster]
     3. (Chem.) An element or radical whose valence is three.
        [1913 Webster]
     Triads of the Welsh bards, poetical histories, in which the
        facts recorded are grouped by threes, three things or
        circumstances of a kind being mentioned together.
     Hindu triad. See Trimurti.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: the cardinal number that is the sum of one and one and one
           [syn: three, 3, III, trio, threesome, tierce,
           leash, troika, triad, trine, trinity, ternary,
           ternion, triplet, tercet, terzetto, trey, deuce-
      2: a set of three similar things considered as a unit [syn:
         trio, triad, triplet, triple]
      3: three people considered as a unit [syn: trio, threesome,
         triad, trinity]
      4: a three-note major or minor chord; a note and its third and
         fifth tones [syn: common chord, triad]

From Moby Thesaurus II by Grady Ward, 1.0 :

  59 Moby Thesaurus words for "triad":
     arpeggio, broken chord, chord, clover, common chord, concento,
     concord, consonant chord, deuce-ace, diminished seventh chord,
     dominant chord, enharmonic, leash, major triad, minor chord,
     set of three, seventh chord, shamrock, sixth chord, tercet,
     ternary, ternion, terzetto, three, threesome, tierce, tonic triad,
     trefoil, trey, trialogue, triangle, tricorn, trident, triennium,
     trihedron, trilogy, trimester, trine, trinity, trinomial, trio,
     triphthong, triple, triple crown, triple threat, triplet, triplopy,
     tripod, triptych, trireme, triseme, triskelion, trisul,
     triumvirate, triune, triunity, trivet, troika, unbroken chord

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