WordWeb Online

1. An inclination to do something
   "he felt propensities toward frivolity";
   - leaning, tendency
    
2. A natural inclination
   "he has a propensity for exaggeration";
   - proclivity, leaning
    
3. A disposition to behave in a certain way
   "the propensity of disease to spread";
   - aptness

Derived forms: propensities

Type of: disposition, inclination, tendency

Encyclopedia: Propensity