MALIGNANCY Meaning of MALIGNANCY in English [ mə'lɪgnənsi ]■ noun ( plural malignancies ) 1》 the state or presence of a malignant tumour; cancer. ↘a cancerous growth. ↘a form of cancer. 2》 the quality of being malign. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004