Noun propensity has 3 senses
  1. leaning, propensity, tendency - an inclination to do something; "he felt leanings toward frivolity"
    --1 is a kind of inclination
  2. proclivity, propensity, leaning - a natural inclination; "he has a proclivity for exaggeration"
    --2 is a kind of inclination, disposition, tendency
  3. 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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