Definition of propensitude in US English:

propensitude

noun

  • Inclination, tendency, or propensity to or towards a person or thing. Compare "propensity". archaic and humorous in later use. Now rare.

Origin

Early 17th century; earliest use found in John Marston (bap. 1576, d. 1634), poet and playwright. From classical Latin prōpēns-, past participial stem of prōpendēre propend + -itude, after e.g. magnitude.