Meaning of TRIAD in English

TRIAD

[tri.ad] n [L triad-, trias, fr. Gk, fr. treis three] (1546) 1: a union or group of three: trinity

2: a chord of three tones consisting of a root with its third and fifth and constituting the harmonic basis of tonal music -- tri.ad.ic adj -- tri.ad.i.cal.ly adv

Merriam-Webster English vocab.      Английский словарь Merriam Webster.