/ Dictionary / Index D deficience: Meaning and Definition of Find definitions for: de•fi•cience Pronunciation: (di-fish'uns), [key] — n. Obs. deficiency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. defibrinate deficiency Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language