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Noun propensity has 3 senses
leaning, propensity, tendency - an inclination to do something; "he felt leanings toward frivolity"--1 is a kind of inclination
 
proclivity, propensity, leaning - a natural inclination; "he has a proclivity for exaggeration"--2 is a kind of inclination, disposition, tendency
 
aptness, propensity - a disposition to behave in a certain way; "the aptness of iron to rust"; "the propensity of disease to spread"--3 is a kind of disposition
 
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