Any of various forms of therapy (chiefly involving hypnosis) in which regression is induced, typically in order to discover possible causes of a disorder, habit, etc., or to recover repressed memories.
Origin
1960s.
Definition of regression therapy in US English:
regression therapy
noun
Psychology
Any of various forms of therapy (chiefly involving hypnosis) in which regression is induced, typically in order to discover possible causes of a disorder, habit, etc., or to recover repressed memories.