noun, plural proclivities.
natural or habitual inclination or tendency; propensity; predisposition: a proclivity to meticulousness.

1585–95; < Latin prōclīvitās tendency, literally, a steep descent, steepness, equivalent to prōclīv(is) sloping forward, steep (prō- pro-1 + clīv(us) slope + -is adj. suffix) + -itās -ity

bent, leaning, disposition.

aversion. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
proclivity (prəˈklɪvɪtɪ)
n , pl -ties
a tendency or inclination
[C16: from Latin prōclīvitās, from prōclīvis steep, from pro-1 + clīvus a slope]

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

1591, from L. proclivitatem (nom. proclivitas) "a tendency, propensity," from proclivis "prone to," lit. "sloping," from pro- "forward" + 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
Their efforts begin with some similarities, and then their imaginations and
  proclivities go to work.
Such an occupation would make use of my education, and it would satisfy my
  bookish proclivities.
It will also forbid insurers from discriminating against individuals because of
  genetic proclivities.
Everyone grows a form of the drug, regardless of their political leanings or
  recreational proclivities.
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