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(r?gr?sh"?n), n.[L. regressio: cf. F. rgression.] 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. スポンサード リンク
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