the performance by a public official of an act that is legally unjustified, harmful, or contrary to law; wrongdoing (used esp. of an act in violation of a public trust). Compare misfeasance(def. 2), nonfeasance.
mal·fea·sance (māl-fē'zəns) n. Misconduct or wrongdoing, especially by a public official.
[Anglo-Norman malfaisance, from Old French malfaisant, malfeasant, present participle of malfaire, to do evil, from Latin malefacere; see malefactor.] mal·fea'sant adj. & n.
1696, from Fr. malfaisance "wrongdoing," from mal- "badly" (see mal-) + faisant, prp. of faire "to do," from L. facere "to do" (see factitious). Malfeasor "wrong-doer" is attested from c.1330.
Main Entry: mal·fea·sance Pronunciation: "mal-'fEz-&ns Function: noun Etymology: mal- bad + obsolete English feasance doing, execution, from Old French faisance, from fais-, stem of faire to make, do, from Latin facere : the commission (as by a public official) of a wrongful or unlawful act involving or affecting the performance of one's duties —compare MISFEASANCE, NONFEASANCE