ar·son (är'sən) n. The crime of maliciously, voluntarily, and willfully setting fire to the building, buildings, or other property of another or of burning one's own property for an improper purpose, as to collect insurance.
[Anglo-Norman, from Late Latin ārsiō, ārsiōn-, from Latin ārsus, past participle of ārdēre, to burn; see as- in Indo-European roots.] ar'son·ist n.