Medical Definition of regression
: a trend or shift toward a lower, less severe, or less perfect state: asa: progressive decline (as in size or severity) of a manifestation of disease <tumor regression following radiation>b: a gradual loss of differentiation and function by a body part especially as a physiological change accompanying aging <menopausal regression of the ovaries>: gradual loss (as in old age) of memories and acquired skillsc: 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 regression towards childhood—Havelock Ellis>
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