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Definition of ninth:

  1. A chord of the dominant seventh with the ninth added.
  2. An interval containing an octave and a second.
  3. Constituting or being one of nine equal parts into which anything is divided.
  4. Following the eight and preceding the tenth; coming after eight others.
  5. The quotient of one divided by nine; one of nine equal parts of a thing; the next after the eighth.


ordinal, one-ninth, ninefold, nonary, novenary, 9th.

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