re·gres·sion
n : a trend or shift toward a lower, less severe, or less perfect state: as a : progressive decline (as in size or severity) of a manifestation of disease <tumor following radiation> b (1) : a gradual loss of differentiation and function by a body part esp. as a physiological change accompanying aging <menopausal of the ovaries> (2) : gradual loss (as in old age) of memories and acquired skills c : reversion to an earlier mental or behavioral level or to an earlier stage of psychosexual development in response to organismic stress or to suggestion <a protective towards childhood -Havelock Ellis> .
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