1. (

• leaning ,
• propensity ,
• tendency

) an inclination to do something; "he felt leanings toward frivolity" ;

2. (

• proclivity ,
• propensity ,
• leaning

) a natural inclination; "he has a proclivity for exaggeration" ;

3. (

• aptness ,
• propensity

) a disposition to behave in a certain way; "the aptness of iron to rust"; "the propensity of disease to spread" ;