malignancyPronunciation: /məˈlɪgnənsi/Translate malignancy | into Italian Definition of malignancy noun (plural malignancies) [mass noun] 1the state or presence of a malignant tumour; cancer:after biopsy, evidence of malignancy was found [count noun] a cancerous growth: a malignancy had been removed from the left ventricle [count noun] a form of cancer: diffuse malignancies such as leukaemia 2the quality of being malign:her eyes sparkled with renewed malignancymalignancy in other Oxford dictionaries Definition of malignancy in the US English dictionary