early 13c., from O.Fr. pite, pitet (11c., Mod.Fr. pitié), from L. pietatem (nom. pietas) "piety, affection, duty," in L.L. "gentleness, kindness, pity," from pius (see
pious). Replaced O.E. mildheortness, lit. "mild-heartness," itself a loan-translation of L. misericordia.