/ Dictionary / Index P projection booth: Meaning and Definition of Find definitions for: projec'tion booth" Pronunciation: [key] a soundproof compartment in a theater where a motion-picture projector is housed and from which the picture is projected on the screen. a compartment at the rear of or above an auditorium, in which spotlights and other lighting units are operated. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. projection projectionist Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language