the act of going back to a previous place or state; return or reversion.

retrogradation; retrogression.

Biology . reversion to an earlier or less advanced state or form or to a common or general type.

Psychoanalysis . the reversion to a chronologically earlier or less adapted pattern of behavior and feeling.

a subsidence of a disease or its manifestations

a regression of symptoms.

of, pertaining to, or determined by regression analysis

regression curve; regression equation.

noun

retrogradation , retrogression