Webster’s Revised Unabridged Dictionary · 1913
Propensity
Pro·pen′si·ty (·pĕn′sĭ·ty̆), 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.
Syn. — Disposition; bias; inclination; proclivity; proneness; bent; tendency.