DIMINISHED
Text: Made less. 1) Diminished intervals are those made less than minor; G# to Fn is a diminished 7th, because G to F being a minor 7th, G# to F contains one semitone lessthan the minor interval. 2) A diminished triad is the chord consisting of two thirds on the subtonic, e.g., B, D, F, in the key of C.
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Source: 125