/ Dictionary / Index M malignancy: Meaning and Definition of Find definitions for: ma•lig•nan•cy Pronunciation: (mu-lig'nun-sē), [key] — pl. -cies the quality or condition of being malignant. malignant character, behavior, action, or the like: the malignancies of war. a malignant tumor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: malignancy (Thesaurus) malign malignant Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language