Triad

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