/ Dictionary / Index S senescent: Meaning and Definition of Find definitions for: se•nes•cent Pronunciation: (si-nes'unt), [key] — adj. growing old; aging. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: senescent (Thesaurus) Senegambia seneschal Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language