Etymology of the English word propensity
the English word propensity
derived from the English word propense
derived from the Latin word propensus (ready, eager, willing)
derived from the Latin word propendere (hand down; weigh more; be inclined)
derived from the New Latin word pro-
using the Greek prefix pro-, προ- (before)
derived from the Proto-Indo-European root *per
derived from the Latin word pendere (hang, hang down; depend; weigh out; pay, pay out)
using the English suffix -ity