/ Dictionary / Index D dies non: Meaning and Definition of Find definitions for: di•es non Pronunciation: (dī'ēz non', dē'ās nōn'), [key] — Law. Law. a day on which no courts can be held. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diesis diester Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language