Re*gress" (r?*gr?s"), v. i. [imp. & p. p. Regressed (-gr?st"); p. pr. &
vb. n. Regressing.] To go back; to return to a former place or state.
Sir T. Browne.
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.