Regression
Pronunciation : Re*gres"sion (r*grsh"n)
Part of Speech : n.
Etymology : [L. regressio: cf. F. r?gression.]
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913