v. in·sured, in·sur·ing, in·sures
a. To provide or arrange insurance for: a company that insures homeowners and businesses.
b. To acquire or have insurance for: insured herself against losses; insured his car for theft.
2. To make sure, certain, or secure. See Usage Note at assure.
To buy or sell insurance.
[Middle English ensuren, to assure, from Old French enseurer, possibly variant of assurer; see ASSURE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.