/ Dictionary / Index S sixteenth: Meaning and Definition of Find definitions for: six•teenth Pronunciation: (siks'tēnth'), [key] — adj. next after the fifteenth; being the ordinal number for 16. being one of 16 equal parts. —n. a sixteenth part, esp. of one (). the sixteenth member of a series. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sixteenth (Thesaurus) sixteenpenny Sixteenth Amendment Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language