/ Dictionary / Index N ninth: Meaning and Definition of Find definitions for: ninth Pronunciation: (n?nth), [key] ? adj. next after the eighth; being the ordinal number for nine. being one of nine equal parts. ?n. a ninth part, esp. of one (). the ninth member of a series. a tone distant from another tone by an interval of an octave and a second. the interval between such tones. harmonic combination of such tones. ?adv. in the ninth place. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. See also: ninth (Thesaurus) Nintendo Ninth Amendment Related Content Daily Word Quiz: ravenous Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language