/ Dictionary / Index O outer automorphism: Meaning and Definition of Find definitions for: out'er automor'phism Pronunciation: [key] — Math. Math. an automorphism that is not an inner automorphism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. outer outer bar Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language