/ Dictionary / Index O OSHA: Meaning and Definition of Find definitions for: OSHA Pronunciation: (ō'shu, osh'u), [key] — n. U.S. Govt. the division of the Department of Labor that sets and enforces occupational health and safety rules. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: osha (Thesaurus) Osh Oshawa Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language