2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
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.
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.
3. (Chem.) An element or radical whose valence is three
{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}.
From WordNet r 1.6 [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}, {trine}, {trinity}, {ternary}, {ternion},
{triplet}, {tercet}, {terzetto}, {trey}, {deuce-ace}]
2: a set of three similar things considered as a unit [syn: {trio},
{triplet}]
3: three people considered as a unit [syn: {trio}, {threesome},
{trinity}]
4: a 3-note major or minor chord; a note and its third and
fifth tones [syn: {common chord}]
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