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[non- + obsolete English feasance doing, execution, from Anglo-French fesance, from Old French faisance act, from fais-, stem of faire to do, from Latin facere]
: the failure or omission to do something that should be done or esp. something that one is under a duty or obligation to do compare malfeasance, misfeasance
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.