ensure

American  

[en-shoor, -shur] / ɛnˈʃʊər, -ˈʃɜr /

verb (used with object)

ensured, ensuring

1. to secure or guarantee.

   This letter will ensure you a hearing.

2. to make sure or certain.

   measures to ensure the success of an undertaking.

3. to make secure or safe, as from harm.

   Synonyms:

   safeguard, guard, protect

4. insure.

---

ensure British  

/ -ˈʃɔː, ɛnˈʃʊə /

verb

1. (may take a clause as object) to make certain or sure; guarantee

   this victory will ensure his happiness

2. to make safe or secure; protect

---

Usage

What's the difference between ensure, insure, and assure? Ensure most commonly means to guarantee or make certain, as in Working hard ensures success. Insure typically means to guarantee against loss or harm or, more specifically, to cover with insurance. Assure usually means to tell someone something with confidence or to cause someone to know something with certainty—it often means the same thing as reassure. It’s no wonder there’s confusion between the three words—all three are verbs that are based on the Latin root sēcūrus, 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’s insurance. These kinds of insurance insure you—they 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’s used in the phrase rest assured. Here’s a quick cheat sheet to remember the most common uses of each word:ensure = make sureinsure = cover with insuranceassure = reassureHere’s an example of ensure, insure, 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 ensure, insure, and assure.

Other Word Forms

• ensurer noun
• unensured adjective

Etymology

Origin of ensure

First recorded in 1350–1400; Middle English ensuren, from Anglo-French enseurer; see en- ¹ ( def. ), sure ( def. )

Explanation

When you ensure that something will happen, you guarantee it. All that homework will ensure that you have no time for fun this afternoon! Ensure comes from the Old French en- "make" plus seur "sure," and that is exactly what it means today - "to make sure or certain, to guarantee." If you ensure success or someone's safety, you are guaranteeing it. Make sure you can really come through with something before you ensure it!

Example Sentences

That is part of the reason Darpa wanted to invest in Gazelle: The Pentagon was trying to ensure a foothold in a market that was increasingly dominated by commercial interests.

From The Wall Street Journal • Apr. 20, 2026

Tamil Nadu Chief Minister MK Stalin said the deaths had caused "immense sorrow" and that he had instructed officials to ensure all necessary assistance.

From BBC • Apr. 20, 2026

For instance, companies need solutions to set the right user-account safeguards for agents to ensure they are limited in permissions.

From MarketWatch • Apr. 20, 2026

Under these laws, providers are using telehealth and mailed medication abortion to ensure that those living in ban states can still get the health care they need.

From Slate • Apr. 20, 2026

Her brother’s recommendation was enough to ensure her favour; his judgement could not err.

From "Pride and Prejudice" by Jane Austen

Related Words

• assure
• establish
• insure
• protect
• provide
• safeguard
• secure