/ Dictionary / Index A act curtain: Meaning and Definition of Find definitions for: act' cur"tain Pronunciation: [key] a curtain for closing the proscenium opening between acts or scenes. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. act call actg. Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language