Pro-pĕn'sion or Pro-pĕn'si-ty, n.

n. [Lat. propensio, Fr. & Sp. propension, It. propensione. See PROPEND and PROPENSE.] The state of being propense or inclined; natural inclination; disposition to do good or evil; bent of mind; tendency.

The most frightful of the forms which his disease took, was a propensity to utter blasphemy. Macaulay.

Synonyms—Disposition; bias; inclination; proclivity; proneness.