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18.118.142.17

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From: Webster's Revised Unabridged Dictionary (1913)

 Re·gres·sion n.  The act of passing back or returning; retrogression; retrogradation.
 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.