/ Dictionary / Index A auth.: Meaning and Definition of Find definitions for: auth. Pronunciation: [key] authentic. author. authority. authorized. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. auteur theory, authentic Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language