#1
propensity n. [
leaning, tendency] an inclination to do something; "he felt leanings toward frivolity"
. wn #2
propensity n. [
proclivity, leaning] a natural inclination; "he has a proclivity for exaggeration"
. wn #3
propensity n. [
aptness] a disposition to behave in a certain way; "the aptness of iron to rust"; "the propensity of disease to spread"
. wn