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malignancy (n.)
c. 1600, "malignant nature;" 1650s, "state of extreme malevolence, bitter enmity," from malignant + abstract noun suffix -cy. Of diseases, growths, tumors, etc., "virulence, tendency to get worse," from 1680s. In English history, "adherence to the royal party in the time of Cromwell," 1640s, from malignants, a term applied to the royalists by their enemies.
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Definitions of malignancy from WordNet
Dictionary entries near malignancy
malice
malicious
maliciously
maliciousness
malign
malignancy
malignant
maligner
malignity
malinger
malison