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declivity

[dih-kliv-i-tee] /dɪˈklɪv ɪ ti/
noun, plural declivities.
1.
a downward slope, as of ground (opposed to acclivity).
Origin of declivity
1605-1615
1605-15; < L of dēclīvitās a slope, hill, equivalent to dēclīvi(s) sloping downward (dē- de- + clīv(us) slope, hill + -is adj. suffix) + -tās -ty2
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for declivity

declivity

/dɪˈklɪvɪtɪ/
noun (pl) -ties
1.
a downward slope, esp of the ground Compare acclivity
Derived Forms
declivitous, adjective
Word Origin
C17: from Latin dēclīvitās, from de- + clīvus a slope, hill
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for declivity
n.

1610s, from French déclivité, from Latin declivitatem (nominative declivitas) "a slope, declivity," 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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