noun, plural propensities.
a natural inclination or tendency: a propensity to drink too much.
Obsolete. favorable disposition or partiality.

1560–70; propense + -ity

1. bent, leaning, disposition, penchant, proclivity. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
propensity (prəˈpɛnsɪtɪ)
n , pl -ties
1.  a natural tendency or disposition
2.  obsolete partiality
[C16: from Latin prōpensus inclined to, from prōpendēre to propend]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1570, "disposition to favor," from obsolete adj. propense "inclined, prone" (1528), from L. propendere "incline to, hang forward, weigh over," from pro- "forward" + pendere "hang" (see pendant)
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Apart from a propensity to pounce on prey, cats' aloof elegance has long made
  them the choice for animal companionship.
But odder still is the coyote's propensity for breeding with wolves.
In his journal he wrote that he was not bothered by the residents' propensity
  for cannibalism.
Educators have mixed feelings about this propensity to cluster together.
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