diminished seventh

noun

Definition of diminished seventh

  1. 1 :  a musical interval (see interval 2c)that is smaller than a seventh by a semitone

  2. 2 or diminished seventh chord :  a seventh chord that is often built on the leading tone, that spans the interval (see interval 2c)of a diminished seventh (sense 1), and that consists of three minor thirds —called also diminished chord — see seventh chord illustration

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1753

First Known Use of diminished seventh

1753


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