/ Dictionary / Index D decondition: Meaning and Definition of Find definitions for: de•con•di•tion Pronunciation: (dē"kun-dish'un), [key] — v.t. to diminish the physical strength, stamina, or vitality of; weaken. to diminish or eliminate the conditioned responses or behavior patterns of. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. deconcentrate decongest Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language