Etymology
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triad (n.)

1540s, "group or set of three," from Late Latin trias (genitive triadis), from Greek trias (genitive triados) "a triad, the number three," from treis "three" (see three). Musical sense of "chord of three notes" is from 1801. Related: Triadic.

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Definitions of triad

triad (n.)
the cardinal number that is the sum of one and one and one;
Synonyms: three / " / iii / trio / threesome / tierce / leash / troika / trine / trinity / ternary / ternion / triplet / tercet / terzetto / trey / deuce-ace
triad (n.)
a set of three similar things considered as a unit;
Synonyms: trio / triplet / triple
triad (n.)
three people considered as a unit;
Synonyms: trio / threesome / trinity
triad (n.)
a three-note major or minor chord; a note and its third and fifth tones;
Synonyms: common chord
From wordnet.princeton.edu