triad (redirected from common chord)

Triad

Term used variously for secret societies in Qing-dynasty China (and sometimes earlier), for modern Chinese crime gangs, and for crime gangs of other Asian nationals operating in their own countries or abroad. A secret society with the name Triad started operating in the early 19th century in southern China, where it took root and spread. In the 1850s Triad rebellions threatened Shanghai and Xiamen (Amoy) and contributed to the revolution of 1911. Chinese secret societies have in common the swearing of an oath to join, strict rules, a family relationship among members, the duty of mutual help, a hierarchy of functions, and hereditary membership within families.

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triad

1. Chem an atom, element, group, or ion that has a valency of three

2. Music a three-note chord consisting of a note and the third and fifth above it

3. an aphoristic literary form used in medieval Welsh and Irish literature

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Triad

any of several Chinese secret societies, esp one involved in criminal activities, such as drug trafficking