DECLIV'ITY, noun [Latin sloping.] Declination from a horizontal line; descent of land; inclination downward; a slope; a gradual descent of the earth, of a rock or other thing: chiefly used of the earth, and opposed to acclivity, or ascent; the same slope, considered as descending, being a declivity and considered as ascending, an acclivity.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.