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]