Ninth , n.
1. The quotient of one divided by nine; one of nine equal
parts of a thing; the next after the eighth.
2. (Mus.) (a) An interval containing an octave and a
second. (b) A chord of the
dominant seventh with the ninth added.
Ninth (?), a. [From Nine; cf. AS. nigoða.]
1. Following the eight and
preceding the tenth; coming after eight others.
2. Constituting or being one of
nine equal parts into which anything is divided.
Hear it pronounced