'Ninth' definitions:

Definition of 'ninth'

adjective

Coming next after the eighth and just before the tenth in position [syn: ninth, 9th]

noun

Position nine in a countable series of things; "going into the ninth they were a run ahead"

noun

One part in nine equal parts [syn: one-ninth, ninth]

From: GCIDE

Ninth \Ninth\, a. [From Nine; cf. AS. nigo[eth]a.]
1. Following the eight and preceding the tenth; coming after eight others. [1913 Webster]
2. Constituting or being one of nine equal parts into which anything is divided. [1913 Webster]

From: GCIDE

Ninth \Ninth\, n.
1. The quotient of one divided by nine; one of nine equal parts of a thing; the next after the eighth. [1913 Webster]
2. (Mus.) (a) An interval containing an octave and a second. (b) A chord of the dominant seventh with the ninth added. [1913 Webster]