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n. 1. The ordinal number matching the number nine in a series. 2. One of nine equal parts. 3. Music a. A harmonic or melodic interval of an octave and a second. b. The tone at the upper limit of such an interval. c. A chord consisting of a root with its third, seventh, and ninth. [Middle English ninthe, from Old English nigonthe, from nigon, nine; see new in the Appendix of Indo-European roots.] ninth adv. & adj. |
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