[ˈtrʌɪad], (Noun)

Definitions:
- a group or set of three related people or things
(e.g: the triad of medication, diet, and exercise are necessary in diabetes care)

- a secret society originating in China, typically involved in organized crime


Phrases:

Origin:
mid 16th century: from French triade, or via late Latin from Greek trias, triad-, from treis ‘three’. Sense 2 is a translation of Chinese San Ho Hui, literally ‘three unite society’, i.e. ‘triple union society’, said to mean ‘the union of Heaven, Earth, and Man’