n. [ L. egressio. ] The act of going; egress. [ R. ] B. Jonson. [ 1913 Webster ]
n. [ L. regressio: cf. F. régression. ] The act of passing back or returning; retrogression; retrogradation. Sir T. Browne. [ 1913 Webster ]
Edge of regression (of a surface) (Geom.),
Regression point (Geom.),