Dictionary

misfeasance

noun mis·fea·sance \mis-ˈfē-zən(t)s\

Definition of MISFEASANCE

:  trespass; specifically :  the performance of a lawful action in an illegal or improper manner
mis·fea·sor \-ˈfē-zər, -ˌzr\ noun

Origin of MISFEASANCE

Middle French mesfaisance, from mesfaire to do wrong, from mes- mis- + faire to make, do, from Latin facere — more at do
First Known Use: 1596

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