regression toward the mean is a noun meaning "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)". It carries one recorded sense.
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
Definitions, synonyms and semantic relations for regression toward the mean come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.