1610s, from French déclivité, from Latin declivitatem/dēclīvitās, from dēclivis (“a sloping downward”), from de (“down”) + clīvus (“a slope”), from Proto-Indo-European *ḱleywo-, from Proto-Indo-European *ḱley- (“to lean”) (English lean).
declivity (plural declivities)
- (geomorphology) the downward slope of a hill
- a downward bend in a path
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