mid-15c., from Old French maledicion "a curse" (15c.), from Latin maledictionem (nominative maledictio) "the action of speaking evil of, slander," in Late Latin "a curse," noun of action from past participle stem of maledicere "to speak badly or evil of, slander," from male "badly" (see mal-) + dicere "to say" (see diction).[malediction etymology, malediction origin, 英语词源]