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proclivity (n.)

"inclination, propensity, tendency," 1590s, from French proclivité or directly from Latin proclivitatem (nominative proclivitas) "a tendency, predisposition, propensity," from proclivis "prone to," literally "sloping, inclined," from pro "forward" (see pro-) + clivus "a slope" (from PIE *klei-wo-, suffixed form of root *klei- "to lean").

Proclivous (1730) "tending, sloping" seems to have been a mere dictionary word for most of its existence, though it began to acquire some technical senses after c. 1890.

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Definitions of proclivity from WordNet

proclivity (n.)
a natural inclination;
he has a proclivity for exaggeration
Synonyms: propensity / leaning
From wordnet.princeton.edu