certainty

noun

cer·​tain·​ty ˈsər-tᵊn-tē 

plural certainties

1

: something that is certain

2

: the quality or state of being certain especially on the basis of evidence

Synonyms of certainty

• assurance
• confidence
• satisfaction
• conviction

Choose the Right Synonym for certainty

certainty, certitude, conviction mean a state of being free from doubt.

certainty and certitude are very close; certainty may stress the existence of objective proof,

claims that cannot be confirmed with scientific certainty

while certitude may emphasize a faith in something not needing or not capable of proof.

believes with certitude in an afterlife

conviction applies especially to belief strongly held by an individual.

holds firm convictions on every issue

Examples of certainty in a Sentence

Scientists still do not know with any degree of certainty why the disease spread so quickly.

We cannot predict the outcome with absolute certainty.

There was no certainty that the package would arrive in time.

Her certainty about these complex moral issues is surprising.

Recent Examples on the Web

The French documentary is set inside the country’s prison officer academy, where the film observes trainees as their language, movements and certainties gradually align with the institution around them. —Naman Ramachandran, Variety, 9 May 2026

The files reflect cases that the government deems unresolved, meaning that for a variety of reasons they couldn’t be explained with certainty. —Seung Min Kim, Fortune, 9 May 2026

The one certainty is that Counsell is not using the Cubs’ hot streak as a reason to stick with the status quo. —Paul Sullivan, Chicago Tribune, 9 May 2026

Sellers may additionally be assuaged by having greater certainty a deal will actually go through, which is why limiting or waiving contingencies, such as for a home inspection or appraisal, can boost your odds. —Becca Stanek, TheWeek, 8 May 2026

Word History

Etymology

Middle English certeinte, borrowed from Anglo-French certeinté, from certein, certain certain entry 1 + -té -ty

First Known Use

14th century, in the meaning defined at sense 1

Phrases Containing certainty

• almost a certainty
• with certainty

Rhymes for certainty

• uncertainty

Kids Definition

certainty

noun

cer·​tain·​ty ˈsərt-ᵊn-tē 

plural certainties

1

: something certain

2

: the quality or state of being or feeling certain