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.
(mÉ-lÄ­g'nÉnt) 1  Tending to have a destructive clinical course, as a malignant illness. 2  Relating to cancer cells that are invasive and tend to metastasize. Malignant tumor cells are histologically more primitive than normal tissue.