Meaning of TRIAD in English

noun Etymology: Latin ~-, trias, from Greek, from treis three Date: 1546 a union or group of three ; Trinity , a chord of three tones consisting of a root with its third and fifth and constituting the harmonic basis of tonal music, ~ic adjective ~ically adverb

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.