triad

A chord of three tones none of which is an octave transposition on another.

The Major Triad in Just Intonation contains three tones whose frequency relations are 4:5:6 or 1/1 5/4 and 3/2.

The Minor Triad is 10:12:15 or 1/1 6/5 and 3/2.

Other triads such as the Septimal Minor 6:7:9 or 1/1 7/6 and 3/2 are used in extended Just Intonation tuning systems.

See also hexad and tetrad.

[from John Chalmers, Divisions of the Tetrachord]

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