guarantee
Americannoun
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a promise or assurance, especially one in writing, that something is of specified quality, content, benefit, etc., or that it will perform satisfactorily for a given length of time.
a money-back guarantee.
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an assurance that another’s obligation will be fulfilled, or something presented as such security; guaranty.
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something that assures a particular outcome or condition.
Wealth is no guarantee of happiness.
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a person who gives a guarantee or guaranty; guarantor.
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a person to whom a guarantee is made.
verb (used with object)
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to secure, as by giving or taking security.
A credit card guarantees your reservation at the hotel.
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to make oneself answerable for (something) on behalf of someone else who is primarily responsible.
to guarantee the fulfillment of a contract.
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to undertake to ensure for another, as rights or possessions.
The Constitution guarantees freedom of religion.
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to serve as a warrant or guaranty for.
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to undertake to protect or indemnify.
to guarantee a person against loss.
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to undertake (to do something).
I will guarantee to prove every word I stated.
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to promise (usually followed by a clause as object).
I guarantee that I'll be there.
noun
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a formal assurance, esp in writing, that a product, service, etc, will meet certain standards or specifications
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law a promise, esp a collateral agreement, to answer for the debt, default, or miscarriage of another
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a person, company, etc, to whom a guarantee is made
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a person, company, etc, who gives a guarantee
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a person who acts as a guarantor
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something that makes a specified condition or outcome certain
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a variant spelling of guaranty
verb
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(also tr) to take responsibility for (someone else's debts, obligations, etc)
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to serve as a guarantee for
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to secure or furnish security for
a small deposit will guarantee any dress
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to undertake to protect or keep secure, as against injury, loss, etc
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to ensure
good planning will guarantee success
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(may take a clause as object or an infinitive) to promise or make certain
Usage
What does guarantee mean? A guarantee is a promise or assurance, especially one that is written or legally binding, that something is of a stated quality or will perform as stated, such as a guarantee that a car you purchase will operate correctly. A guarantee is also an assurance of a particular outcome or condition, as in Weather predictions are not guarantees. Weather often changes quickly. To guarantee something is to secure something, as a ticket guarantees entry to a movie showing. As well, to guarantee is to promise to do something, usually by signing a legally binding agreement, as in The company guaranteed me a job when I signed the contract. Example: I guarantee you will love your purchase and will give you a full refund if you don’t.
Other Word Forms
Derived Forms
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nonguaranteenoun
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preguaranteenoun
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reguaranteenoun
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superguaranteenoun
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quasi-guaranteedadjective
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unguaranteedadjective
Inflected Forms
Nouns
Participles
Conjugated Forms
Present
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guaranteesimple
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guaranteessimple
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have guaranteedperfect
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has guaranteedperfect
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am guaranteeingprogressive
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are guaranteeingprogressive
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is guaranteeingprogressive
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have been guaranteeingperfect progressive
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has been guaranteeingperfect progressive
Past
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guaranteedsimple
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had guaranteedperfect
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was guaranteeingprogressive
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were guaranteeingprogressive
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had been guaranteeingperfect progressive
Future
Etymology
Origin of guarantee
First recorded in 1670–80; alteration of guaranty
Explanation
To guarantee is to promise or to a make binding agreement. If a baseball player guarantees his team will win the World Series, he better not lead the league in strikeouts. Guarantee is a word that is both a noun and a verb: the noun means "a binding agreement" and the verb is the act of making that agreement. This word seems to have come from garante, the Spanish word for "protect" and it's related to the Old French word warrant, which means "to authorize." Today, we often come across guarantee in advertisements, and you might wonder how they might guarantee to make your social life better if your teeth are whiter!
Vocabulary lists containing guarantee
Declaration of the Rights of Woman (1791)
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Frindle
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"The Constitution"
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
It’s going to take a few weeks to get a resolution, and there’s no guarantee that anything will change, but I’m glad I went hunting for answers.
From MarketWatch ● Jul. 28, 2026
Algorithmic shifts mean posts from creators with small followings can go viral, while large followings no longer guarantee audience views.
From The Wall Street Journal ● Jul. 27, 2026
So was the loan guarantee program a huge waste of money?
From Slate ● Jul. 27, 2026
Lots of people might opt for the £50,000 guarantee, deciding that it is a life-changing amount of money in itself.
From BBC ● Jul. 26, 2026
“Come on. You’re local and you know the sea around here. You’re the ideal person. Please say yes. I guarantee it’ll be the greatest adventure of your life!”
From "The Boy Who Met a Whale" by Nizrana Farook
These parents read the new constitutional guarantees of freedom for themselves, and demanded they be enforced, long before any Supreme Court told them what those words meant.
From Slate ● Jul. 25, 2026
There are no guarantees Robinhood and Crypto.com ultimately will reach a deal.
From The Wall Street Journal ● Jul. 24, 2026
Burnham spoke to reporters in Bath, it says, telling them he was making no guarantees but wanted to assure himself that "everything has been looked at before this policy proceeds".
From BBC ● Jul. 23, 2026
And there are no guarantees the states won’t be forced to take more dramatic action within the next two years, Marcus said.
From Los Angeles Times ● Jul. 23, 2026
Sharing guarantees success because you’re acknowledging the importance of your network.
From "Saints and Misfits" by S.K. Ali
There were some legitimate failures here: The federal government had guaranteed $535 million in loans to the company, leaving taxpayers on the hook for a significant chunk of change.
From Slate ● Jul. 27, 2026
Tiny funds tend not to last long so the wave of launches this year and next is almost guaranteed to bring hundreds of closures that can blindside unsuspecting owners with tax bills.
From The Wall Street Journal ● Jul. 27, 2026
And understand that the air bag is not guaranteed to deploy.
From MarketWatch ● Jul. 27, 2026
"The thrill of potentially winning £1m is felt less strongly than the fear of giving up a guaranteed £50,000 and ending up with nothing," she says.
From BBC ● Jul. 26, 2026
It was preordained, a bulletproof future they’d tricked themselves into believing was guaranteed to them.
From "We'll Fly Away" by Bryan Bliss
It's not until 2030 that it seeks to achieve its mission of guaranteeing every young person a clear path to good jobs.
From BBC ● Jul. 28, 2026
Micron secured 16 long-term supply deals, guaranteeing approximately $100 billion in revenue and ensuring gross margins well above past peaks.
From Barron's ● Jun. 25, 2026
The idea of guaranteeing future demand to incentivize innovation was borrowed from vaccine development.
From The Wall Street Journal ● Jun. 18, 2026
But when the Legislature voted last year to extend the state climate program, that provision guaranteeing backup funding wasn’t included.
From Los Angeles Times ● Jun. 10, 2026
This couldn’t happen again—I was lucky this time; he still remembered me, even if he couldn’t recall what I had done, but there was no guaranteeing that luck would hold.
From "The Darkest Minds" by Alexandra Bracken
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
