/ Dictionary / Index O OPA: Meaning and Definition of Find definitions for: OPA Pronunciation: [key] — U.S. Govt. U.S. Govt. Office of Price Administration: the federal agency (1941–46) charged with regulating rents and the distribution and prices of goods during World War II. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. op opacify Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language