GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Triad , n. [L. trias, -adis, Gr. , , fr., , three: cf. F. triade. See Three, and cf. Trias, Trio.]
   A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.
   1913 Webster
   (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.
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   (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