"propensity" in the noun sense
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"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License