/ Dictionary / Index S seventeenth: Meaning and Definition of Find definitions for: sev•en•teenth Pronunciation: (sev'un-tēnth'), [key] — adj. next after the sixteenth; being the ordinal number for 17. being one of 17 equal parts. —n. a seventeenth part, esp. of one (). the seventeenth member of a series. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: seventeenth (Thesaurus) seventeen Seventeenth Amendment Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language