Ninth
Vine's Expository Dictionary of NT Words [1]
is found in reference (a) to "the ninth hour" (3 o'clock, p.m.) in Matthew 20:5; 27:45,46; Mark 15:33,34; Luke 23:44; Acts 3:1; 10:3,30; (b) to "the topaz" as the "ninth" foundation of the city wall in the symbolic vision in Revelation 21 ( Revelation 21:20 ).
Webster's Dictionary [2]
(1): ( a.) Constituting or being one of nine equal parts into which anything is divided.
(2): ( n.) The quotient of one divided by nine; one of nine equal parts of a thing; the next after the eighth.
(3): ( a.) Following the eight and preceding the tenth; coming after eight others.
(4): ( n.) A chord of the dominant seventh with the ninth added.
(5): ( n.) An interval containing an octave and a second.
King James Dictionary [3]
Ninth, a. The ordinal of nine designating the number nine, the next preceding ten as the ninth day or month.
Ninth, n. In music, an interval containing an octave and a tone.