Regression testing is something every programmer should do after changing the code.
Elderly individuals sometimes undergo a remarkable regression to a childlike state.
The military's observers reported the regression of the country to a feudal state.
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The word regression is a noun. It cannot be an adjective. When it is paired with another noun, it is a noun adjunct.Examples:"In statistics, regression analysis refers to techniques for modeling and analyzing several variables""Regression techniques are used by psychologists."
of, pertaining to, or determined by regression analysis: regression curve; regression equation. dictionary.com
the prefix of regression is regress
setback or regression
A linear regression