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.