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[Anglo-French arsoun, alteration of Old French arsin, literally, conflagration, from ars, past participle of ardre to burn]
: the act or crime of willfully, wrongfully, and unjustifiably setting property on fire often for the purpose of committing fraud (as on an insurance company)
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.