Definitions
1.nounA grouping of three.
2.nounA word of three syllables.
3.nounA branch of a Chinese underground criminal society, mostly based in Hong Kong.
4.nounOn a CRT display, a group of three neighbouring phosphor dots, coloured green, red, and blue.
5.nounA chord consisting of a root tone, the tone two degrees higher, and the tone four degrees higher in a given scale.