triad

tri|ad /tr'aɪæd/ (triads)
The spelling Triad is also used for meaning 1.
1 [N-COUNT] usu pl, oft N n
The Triads were Chinese secret societies in old China.
2 [N-COUNT] oft N of n
A triad is a group of three similar things. (FORMAL)
For the faculty, there exists the triad of responsibilities: teaching, research, and service.

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