Generally, regression is a move backwards. Specifically:
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- A term for the exploring, with the assistance of a therapist, of (possibly unpleasant) past memories as part of the treatment for mental illnesses. See psychotherapy, hypnotherapy.
- A re-introduction of a defect into a later revision of a product. See engineering, regression testing.
- The phenomenon by which the sea retreats, or regresses, as a consequence of lowering sea level. See geology.
- In statistics: