Declivity Definition
 dĭ-klĭvĭ-tē 
  declivities
  
    noun
  
 
    declivities
  
A downward slope or sloping, as of a hill.
 Webster's New World 
Other Word Forms of Declivity
Noun
Singular:
 declivityPlural:
 declivitiesOrigin of Declivity
-  
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).
From Wiktionary
 -  
Latin dēclīvitās from dēclīvis sloping down dē- de- clīvus slope klei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 
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