diminished seventh

noun

Definition of diminished seventh

1 : a musical interval (see interval sense 2c)that is smaller than a seventh by a semitone
2 or diminished seventh chord : a seventh chord that is often built on the leading tone, that spans the interval (see interval sense 2c)of a diminished seventh (sense 1), and that consists of three minor thirds

called also diminished chord

— see seventh chord

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First Known Use of diminished seventh

1753, in the meaning defined at sense 1

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The first known use of diminished seventh was in 1753

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Cite this Entry

“Diminished seventh.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/diminished%20seventh. Accessed 26 Jan. 2021.

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