/ Dictionary / Index N nineteenth: Meaning and Definition of Find definitions for: nine•teenth Pronunciation: (nīn'tēnth'), [key] — adj. next after the eighteenth; being the ordinal number for 19. being one of 19 equal parts. —n. a nineteenth part, esp. of one (). the nineteenth member of a series. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nineteenth (Thesaurus) 1984* Nineteenth Amendment Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language