say it: ruh-GRESH-uhn
regression is a noun meaning "an abnormal state in which development has stopped prematurely". It carries 4 recorded senses.
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
psychiatry
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)
statistics
returning to a former state
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for regression come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.