1. The crime of intentionally and illegally setting fire to a building or other structure.
2. An instance of this crime: a rash of arsons.
[Anglo-Norman, from Late Latin ārsiō, ārsiōn-, from Latin ārsus, past participle of ārdēre, to burn; see as- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.