/ Dictionary / Index E excussio: Meaning and Definition of Find definitions for: ex•cus•si•o Pronunciation: (ek-skush'ē-ō"), [key] — n. Civ. Law. the exhausting of every remedy against a principal debtor before proceeding against a surety. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. excuss ex-directory Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language