From The Collaborative International Dictionary of English v.0.48 [gcide]:
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) [wn]:
triad
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-
ace}]
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}]
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