AMELIORATION By N., Sam M.S. - 24 noun. a positive development concerning the seriousness of an illness or syndrome, or a lessening of the severity of its signs. AMELIORATION: "The amelioration of Lindsey's cancer astounded the oncologists." Related Psychology Terms Piaget’s Theory of Cognitive Development Using the Hamilton Depression Rating Scale: A Case Study on Grief A Comparison of Maternal and Paternal Filicide Developing a Case Study ATTITUDE SCALES ADOLESCENCE (Theories) Diagnosis and Treatment Planning Selecting a Diagnosis SOCIAL PSYCHIATRY CHILD PSYCHOLOGY Cite this page: N., Sam M.S., "AMELIORATION," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/amelioration/ (accessed August 14, 2022).