malignancy

The state or quality of being malignant.

A malignant tumor.

The state of being malignant, in feeling or purpose; extreme malevolence; bitter enmity; malice: as, malignancy of heart.

In English history, the state of being a malignant; adherence to the royal party in the time of Cromwell and the civil war. See malignant, n., 2.

The property of expressing malice or evil intent; malignant or threatening nature or character; unpropitiousness.

In pathology, virulence; tendency to a worse condition: as, the malignancy of a tumor.

The state of being malignant or diseased.

A malignant cancer; specifically, any neoplasm that is invasive or otherwise not benign.

That which is malign; evil, depravity, malevolence.

(medicine) a malignant state; progressive and resistant to treatment and tending to cause death