- a regressing, or going back; return; movement backward
- retrogression
- Astron. the slow westward shifting of the nodes of an orbit, caused by a perturbation: the complete cycle of the regression of the nodes of the moon's orbit around the earth takes about 18.6 years
- Biol. reversion to an earlier or simpler form, or to a general or common type
- Med. a gradual subsiding of a disease or its symptoms
- Psychoanalysis reversion to earlier or more infantile behavior patterns
- Statistics an estimation technique in which functions or coefficients within functions are designed to estimate values of a dependent variable

Origin of regression

Classical Latin*regressio*