/ Dictionary / Index I IATSE: Meaning and Definition of Find definitions for: IATSE Pronunciation: [key] International Alliance of Theatrical Stage Employees (and Moving Picture Machine Operators of the U.S. and Canada). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -iatry ib. Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language