/ Dictionary / Index E exit pupil: Meaning and Definition of Find definitions for: ex'it pu"pil Pronunciation: [key] — Optics. Optics. the ridge of the entrance pupil of an optical system, indicating the place where the pupil of the eye should be placed to view the object. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. exit poll exit tax Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language