diminished ninth

noun

an interval that is equivalent to narrowing a minor ninth by one chromatic semitone. In twelve-tone equal temperament, it is equivalent to an octave.

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Meanings

noundiminished ninth (plural diminished ninths)

plural diminished ninths

  1. entertainmentan interval that is equivalent to narrowing a minor ninth by one chromatic semitone. In twelve-tone equal temperament, it is equivalent to an octave.
Cite this entry
APA

diminished ninth. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/diminished%20ninth

MLA

“diminished ninth.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/diminished%20ninth. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “diminished ninth,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/diminished%20ninth.

Source: diminished ninth on Wiktionary, CC BY-SA 4.0.