Re*gres"sion (r?*gr?sh"?n), n. [L. regressio: cf. F. régression.]
The act of passing back or returning; retrogression; retrogradation. Sir T. Browne.
Edge of regression (of a surface) (Geom.), the line along which a
surface turns back upon itself; -- called also a cuspidal edge. --
Regression point
(Geom.), a cusp.
Hear it pronounced