/ Dictionary / Index E EPA: Meaning and Definition of Find definitions for: EPA Pronunciation: [key] Environmental Protection Agency: an independent federal agency, created in 1970, that sets and enforces rules and standards that protect the environment and control pollution. eicosapentaenoic acid: an omega-3 fatty acid present in fish oils. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: epa (Thesaurus) EP epact Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language