Etymology
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regression (n.)

early 15c., "act of passing back or returning," from Latin regressionem (nominative regressio) "a going back, a return," noun of action from past-participle stem of regredi "to go back" (see regress (n.)).

From 1590s as "act of returning toward a point of departure" (of fluids, spirits, actions, etc.); from 1640s as "return (to or into) a certain state or condition, relapse." Genetics sense is by 1885.

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Definitions of regression

regression (n.)
an abnormal state in which development has stopped prematurely;
Synonyms: arrested development / fixation / infantile fixation
regression (n.)
(psychiatry) a defense mechanism in which you flee from reality by assuming a more infantile state;
regression (n.)
the relation between selected values of x and observed values of y (from which the most probable value of y can be predicted for any value of x);
Synonyms: simple regression / regression toward the mean / statistical regression
regression (n.)
returning to a former state;
From wordnet.princeton.edu