[ in-shoor, -shur ]
/ 瑟n藞蕛蕣蓹r, -藞蕛蓽r /
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See synonyms for: insure / insured / insuring on Thesaurus.com

verb (used with object), in路sured, in路sur路ing.
to guarantee against loss or harm.
to secure indemnity to or on, in case of loss, damage, or death.
to issue or procure an insurance policy on or for.
verb (used without object), in路sured, in路sur路ing.
to issue or procure an insurance policy.
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Origin of insure

1400鈥50; late Middle English; variant of ensure


o路ver路in路sure, verb (used with object), o路ver路in路sured, o路ver路in路sur路ing.pre路in路sure, verb (used with object), pre路in路sured, pre路in路sur路ing.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2023


What's the difference between聽insure,聽ensure, and聽assure?

Insure typically means to guarantee against loss or harm or, more specifically, to cover with insurance. Ensure most commonly means to guarantee or make certain, as in Working hard ensures success. Assure usually means to tell someone something with confidence or to cause someone to know something with certainty鈥攊t often means the same thing as reassure.

It鈥檚 no wonder there鈥檚 confusion between the three words鈥攁ll three are verbs that are based on the Latin root s膿c奴rus, meaning safe. Making things even more confusing is the fact that ensure and insure can be used interchangeably in most senses. Still, insure is much more commonly used in the context of insurance, like car insurance, health insurance, and homeowner鈥檚 insurance. These kinds of insurance insure you鈥攖hey give you coverage that provides you with compensation in certain cases and situations.

Ensure is typically used in a more general way in the context of actions that are done to make sure that something happens or is the case, as in We need to ensure that the meeting starts on time.

Assure is always used in the context of communication, especially in situations in which someone is trying to make someone else feel better about something. It鈥檚 used in the phrase rest assured.

Here鈥檚 a quick cheat sheet to remember the most common uses of each word:

insure = cover with insurance
ensure = make sure
assure = reassure

Here鈥檚 an example of insure, ensure, and assure used correctly in a sentence.

Example: She assured me that the company has ensured that every employee has the opportunity to be insured.

Want to learn more? Read the full breakdown of the difference between insure, ensure, and assure.

Quiz yourself on聽insure vs. ensure vs.聽assure!

Should insure, ensure, or assure be used in the following sentence?

We need to take action to _____ that this never happens again.

How to use insure in a sentence

British Dictionary definitions for insure

/ (瑟n藞蕛蕣蓹, -藞蕛蓴藧) /

(often foll by against) to guarantee or protect (against risk, loss, etc)we insured against disappointment by making an early reservation
(often foll by against) to issue (a person) with an insurance policy or take out an insurance policy (on)his house was heavily insured against fire; after all his car accidents the company refuses to insure him again
another word (esp US) for ensure (def. 1), ensure (def. 2)
Also (rare) (for senses 1, 2): ensure

Derived forms of insure

insurable, adjectiveinsurability, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012