Proclivity is defined as a tendency to do something, especially something you shouldn’t.
(noun)An example of a proclivity is what causes a person to go to a casino even though they shouldn’t spend money.
See proclivity in Webster's New World College Dictionary
noun pl. proclivities
Origin: L proclivitas < proclivus, downward < pro-, before (see pro-) + clivus, a slope (see declivity)
See proclivity in American Heritage Dictionary 4
noun pl. pro·cliv·i·ties
Origin:
Origin: Latin prōclīvitās
Origin: , from prōclīvis, inclined
Origin: : prō-, forward; see pro-1
Origin: + clīvus, slope; see klei- in Indo-European roots
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