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propensity (n.)

1560s, "disposition to favor;" 1610s, "a bent of mind, natural or acquired," with -ty + obsolete adjective propense "inclined, prone" (1520s), from Latin propensus, past participle of propendere "incline to, hang forward, hang down, weigh over," from pro "forward" (see pro-) + pendere "to hang, cause to hang; weigh" (from PIE root *(s)pen- "to draw, stretch, spin").

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Definitions of propensity from WordNet

propensity (n.)
an inclination to do something;
Synonyms: leaning / tendency
propensity (n.)
a natural inclination;
Synonyms: proclivity / leaning
propensity (n.)
a disposition to behave in a certain way;
the propensity of disease to spread
Synonyms: aptness
From wordnet.princeton.edu