/ Dictionary / Index E epochal: Meaning and Definition of Find definitions for: ep•och•al Pronunciation: (ep'u-kul or, esp. Brit., ē'po-), [key] — adj. of, pertaining to, or of the nature of an epoch. extremely important, significant, or influential. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: epochal (Thesaurus) epoch epoch-making Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language