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.
Medical Definition of melancholia. : a mental condition and especially a manic-depressive condition characterized by extreme depression, psychomotor agitation, and often hallucinations and delusions.