'Propensity' definitions:

Definition of 'propensity'

From: WordNet
noun
An inclination to do something; "he felt leanings toward frivolity" [syn: leaning, propensity, tendency]
noun
A natural inclination; "he has a proclivity for exaggeration" [syn: proclivity, propensity, leaning]
noun
A disposition to behave in a certain way; "the aptness of iron to rust"; "the propensity of disease to spread" [syn: aptness, propensity]

Definition of 'Propensity'

From: GCIDE
  • Propensity \Pro*pen"si*ty\, n.; pl. Propensities. The quality or state of being propense; natural inclination; disposition to do good or evil; bias; bent; tendency. "A propensity to utter blasphemy." --Macaulay. [1913 Webster]
  • Syn: Disposition; bias; inclination; proclivity; proneness; bent; tendency. [1913 Webster]