/ Dictionary / Index E error coin: Meaning and Definition of Find definitions for: er'ror coin" Pronunciation: [key] — Numis. Numis. a coin showing evidence of a mistake in its manufacture. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. error analysis error of closure Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language