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.
Definition of malignant - evil in nature or effect; malevolent, (of a disease) very virulent or infectious. Definition of malignant - evil in nature or effect; malevolent, (of a disease) very virulent or infectious.