n.
Pronunciation: ' tr ī - ˌ ad also - ə d
Function: noun
Etymology: Latin triad-, trias, from Greek, from treis three
Date: 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 \ tr ī - ' a-dik \ adjective
– tri · ad · i · cal · ly \ -di-k( ə -)l ē \ adverb