AMELIORATION By N., Pam M.S. - April 7, 2013 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 ACROMEGALY DYSOSTOSIS WEBER FRACTION THROMBOSIS AFFECTIVE PSYCHOSIS PERCEIVED SUSCEPTIBILITY WEBER-FECHNER LAW ACUTE DELUSIONAL PSYCHOSIS ANDROGEN-INSENSITIVITY SYNDROME CULTURE-BOUND SYNDROME Cite this page: N., Pam M.S., "AMELIORATION," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/amelioration/ (accessed October 21, 2020).