/ Dictionary / Index E eonism: Meaning and Definition of Find definitions for: e•on•ism Pronunciation: (ē'u-niz"um), [key] — n. Psychiatry. the adoption of feminine mannerisms, clothing, etc., by a male. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. eonian eo nomine* Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language