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plural acclivities
(geomorphology) A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent. quotations
Just below it leaned a tottering crag that would have toppled, starting an avalanche on an acclivity where no sliding mass could stop.
1912 January, Zane Grey, chapter 8, in Riders of the Purple Sage […], New York, N.Y., London: Harper & Brothers Publishers