"regression" in the noun sense
1. arrested development, fixation, infantile fixation, regression
an abnormal state in which development has stopped prematurely
psychiatry) a defense mechanism in which you flee from reality by assuming a more infantile state
3. regression, simple regression, regression toward the mean, statistical regression
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)
4. regression, regress, reversion, retrogression, retroversion
returning to a former state
Source: WordNet® (An amazing lexical database of English)
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