PROPENSITY
aptness, propensity
(noun) a disposition to behave in a certain way; “the aptness of iron to rust”; “the propensity of disease to spread”
proclivity, propensity, leaning
(noun) a natural inclination; “he has a proclivity for exaggeration”
leaning, propensity, tendency
(noun) an inclination to do something; “he felt leanings toward frivolity”
Source: WordNet® 3.1
Etymology
Noun
propensity (countable and uncountable, plural propensities)
An inclination, disposition, tendency, preference, or attraction.
Synonyms
• proclivity, propension, predilection, see also predilection
Source: Wiktionary
Pro*pen"si*ty, n.; pl. Propensities (.
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition