De-cliv'i-ty, n.

n. [Lat. declivitas, from declivis, sloping, down hill, from de and clivus, a slope, a hill; Fr. déclivité. Cf. CLIFF.]

1. Deviation from a horizontal line; descent of surface; inclination downward; slope;—opposed to acclivity, or ascent; the same slope, considered as descending, being a declivity, and considered as ascending, an acclivity.
2. A descending surface; a slope.

Commodious declivities and channels for the passage of the waters. Derham.