De*cliv"i*ty (?), n.; pl. Declivities (#). [L. declivitas, fr. declivis sloping, downhill; de + clivus a slope, a hill; akin to clinare to incline: cf. F. d'eclivit'e. 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.
A descending surface; a sloping place.
Commodious declivities and channels for the passage of the waters.
© Webster 1913.