/ Dictionary / Index A ad nauseam: Meaning and Definition of Find definitions for: ad nau•se•am Pronunciation: (ad nô'zē-um, -am"), [key] to a sickening or disgusting degree. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. adnation adnexa Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language