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English definition of “malignancy”

malignancy

noun [C or U] uk   /məˈlɪɡ.nən.si/ specialized us  
a growth that is likely to get worse and lead to death, or the state of being malignant: The malignancy of these tumours makes them difficult to treat. Tests revealed a malignancy that had to be removed.
(Definition of malignancy from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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