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