The use of acceptance tests in subsequent iterations is also known as regression testing. Acceptance testing is a key feature of test-driven development (TDD). In Scrum: Scrum does not specify testing methods, and testing is not a part of the Scrum framework.
Medical Definition of MALIGNANCY. 1. : the quality or state of being malignant.
See Malignant. Extreme malevolence; bitter enmity; malice; as malignancy of heart. 1. Unfavorableness; unpropitiousness; as the malignancy of the aspect of planets. The malignancy of my fate might distemper yours. 2. Virulence; tendency to mortification or to a fatal issue; as the malignancy of an ulcer or of a fever.