/ Dictionary / Index A ad litem: Meaning and Definition of Find definitions for: ad li•tem Pronunciation: (ad' lī'tem), [key] — Law. Law. for the particular action or proceeding: a guardian ad litem. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ad libitum ad litteram* Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language