Etymology
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declivity (n.)

"a downward slope," 1610s, from French déclivité, from Latin declivitatem (nominative declivitas) "a slope, declivity," from declivis "a sloping downward," from de "down" (see de-) + clivus "a slope," from PIE *klei-wo-, suffixed form of root *klei- "to lean."

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Definitions of declivity

declivity (n.)
a downward slope or bend;
Synonyms: descent / fall / decline / declination / declension / downslope
From wordnet.princeton.edu