/ Dictionary / Index A adscititious: Meaning and Definition of Find definitions for: ad•sci•ti•tious Pronunciation: (ad"si-tish'us), [key] — adj. added or derived from an external source; additional. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: adscititious (Thesaurus) ADS adscript Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language