Regression
Regression (r?*gr?sh"?n) , noun
[Latin regressio: compare French régression.]
The act of passing back or returning; retrogression; retrogradation. — Sir T. Browne
Collocations (2)
Edge of regression (Geometry) , the line along which a surface turns back upon itself; -- called also a cuspidal edge.
Regression point (Geometry) , a cusp.