Definition of insure

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in·sure    (n-shr) KEY 

VERB:
in·sured, in·sur·ing, in·sures
VERB:
tr.

1. 1. To provide or arrange insurance for: a company that insures homeowners and businesses.
   2. 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.

VERB:
intr.

To buy or sell insurance.

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ETYMOLOGY:
Middle English ensuren, to assure, from Old French enseurer, possibly variant of assurer ; see assure

OTHER FORMS:
in·sura·bili·ty(Noun), in·sura·ble(Adjective)