GNU Collaborative International Dictionary of English

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1.       
   Declivity , n.; pl. Declivities . [L. declivitas, fr. declivis sloping, downhill; de + clivus a slope, a hill; akin to clinare to incline: cf. F. déclivité. See Decline.]
   Deviation from a horizontal line; gradual descent of surface; inclination downward; slope; -- opposed to acclivity, or ascent; the same slope, considered as descending, being a declivity, which, considered as ascending, is an acclivity.
   1913 Webster
   A descending surface; a sloping place.
   1913 Webster
   Commodious declivities and channels for the passage of the waters.
   Derham.
   
   1913 Webster