Definition of "triad"
noun:
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A grouping of three.
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A chord consisting of a root tone, the tone two degrees higher, and the tone four degrees higher in a given scale.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
On a CRT display, a group of three neighbouring phosphor dots, coloured green, red, and blue.
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A branch of a Chinese underground criminal society, mostly based in Hong Kong.
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