triad
ˈtrʌɪad/Submit
noun
1.
a group or set of three related people or things.
"the triad of medication, diet, and exercise are necessary in diabetes care"
2.
a secret society originating in China, typically involved in organized crime.
3.
Music. a chord of three tones, especially one consisting of a given tone with its major or minor third and its perfect, augmented, or diminished fifth.
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