The difference between Propension and Propensity
When used as nouns, propension means propensity, whereas propensity means a tendency, preference, or attraction.
check bellow for the other definitions of Propension and Propensity
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Propension as a noun (now, rare):
Propensity.
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Propensity as a noun:
A tendency, preference, or attraction.
Examples:
"He has a propensity for lengthy discussions of certain favorite topics."