RhymeZone: regression definitions

Definitions of regression:

noun: returning to a former state
noun: 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)
noun: (psychiatry) a defense mechanism in which you flee from reality by assuming a more infantile state
noun: an abnormal state in which development has stopped prematurely

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See regression used in context: 27 rhymes, several books and articles.