/ Dictionary / Index E errancy: Meaning and Definition of Find definitions for: er•ran•cy Pronunciation: (er'un-sē, ûr'-), [key] — pl. -cies. the state or an instance of erring. tendency to err. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: errancy (Thesaurus) err errand Related Content Daily Word Quiz: acme Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language