Synonyms

for certain

Idioms

Also, for sure. Without doubt. For example, I can't tell for certain if this is the right color, or I know for sure that she has a new car. The first term dates from the early 1300s. The variant, dating from the late 1500s, is also used colloquially to express agreement or assert the truth of a statement, as in Mary is really bossy.—That's for sure, or Are you coming to the party?—For sure I am.

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.

"Obviously, no-one knows for certain, but what people are sure about is that it comes from Oxford. There are many documentary sources confirming that it was a word coined by students there."

From BBC • Jun. 13, 2026

What’s more, many Advantage plans are structured as health maintenance organizations with limited choices of doctors, referral requirements for specialists, and prior authorization requirements for certain procedures.

From Barron's • Jun. 4, 2026

SpaceX plans to reserve 5% of its outstanding common stock for certain employees and others selected by its executive officers, the company said on Monday.

From MarketWatch • Jun. 1, 2026

That matters because reduced DNA repair may be one pathway linking long-term night shift work with higher risk for certain cancers.

From Science Daily • May 30, 2026

She thought for certain it would have been illegal to say out loud.

From "A Place to Belong" by Cynthia Kadohata

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

for certain

Example Sentences

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