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Definition of triad : 1. A chord of three notes.
2. A union of three; three objects treated as one; a ternary; a trinity; as, a triad of deities.
3. An element or radical whose valence is three.
4. The common chord, consisting of a tone with its third and fifth, with or without the octave.

Synonyms:

group, III, tierce, ternary, trine, three-base hit, tether, common chord, terzetto, collar, trey, triune, deuce-ace, triumvirate, one-third, leash, third, ternion, 3, three-bagger, triunity, Trinity, terce, lead, tercet

delta, triplex, triangle, tripod, troika, clover, deltoid, trio, triplet, triptych, trimester, trident, triple, three, threesome, trilogy

Usage examples:

• But this triad had not great importance and it is a mistake to compare it with the Christian trinity. - "Hinduism and Buddhism, Vol I. (of 3) An Historical Sketch", Charles Eliot.
• It is less creditable to England than honourable to France that a Frenchman should have been the first of Shakespearean students to discover and to prove that the great triad of his Roman plays is not a consecutive work of the same epoch. - "A Study of Shakespeare", Algernon Charles Swinburne.
• This awakening is often accompanied with acute suffering, and even if this be avoided, the natural process of the Triad freeing itself is rudely disturbed, and the completion of its freedom is delayed. - "Death--and After?", Annie Besant.