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English definition of “triad”

triad

noun [S] (THREE THINGS)    /ˈtraɪ.æd/ literary
three related things that form a group: the classic triad of the visual arts: architecture, painting and sculptureGroups of things according to numberGroups of people
(Definition of triad noun (THREE THINGS) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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