noun, plural declivities.
a downward slope, as of ground (opposed to acclivity ).

1605–15; < L of dēclīvitās a slope, hill, equivalent to dēclīvi(s) sloping downward (dē- de- + clīv(us) slope, hill + -is adj. suffix) + -tās -ty Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
declivity (dɪˈklɪvɪtɪ)
n , pl -ties
Compare acclivity a downward slope, esp of the ground
[C17: from Latin dēclīvitās, from de- + clīvus a slope, hill]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1612, from L. declivitatem (nom. declivitas), from declivis "a sloping downward," from de- "down" + clivus "a slope," from PIE *klei-wo-, suffixed form of *klei "to lean" (see lean (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Declivity winds should be renamed updraft deflection winds.
Chlorine had hovered in the forest declivity where the five victims lived.
The wind could not help blowing under such conditions any more than water can help flowing rapidly down a steep declivity.
The bare declivity has evidently been worked, and the auriferous gravel must now be packed from the heights.
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