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declivity

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de⋅cliv⋅i⋅ty

[di-kliv-i-tee]
–noun, plural -ties.
a downward slope, as of ground (opposed to acclivity ).

Origin:
1605–15; < L of dēclīvitās a slope, hill, equiv. to dēclīvi(s) sloping downward (dē- de- + clīv(us) slope, hill + -is adj. suffix) + -tās -ty
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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de·cliv·i·ty   (dĭ-klĭv'ĭ-tē)   
n.   pl. de·cliv·i·ties
A downward slope, as of a hill.

[Latin dēclīvitās, from dēclīvis, sloping down : dē-, de- + clīvus, slope; see klei- in Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

declivity 
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, © 2001 Douglas Harper
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