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

• 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

Reality shows exist so that there’s some certainty in the world. —Brian Moylan, Vulture, 31 Oct. 2025

That certainty is now fading, with leading economic figures warning that the near-monthlong standoff is beginning to materially damage the prospects of America’s businesses and consumers. —Eleanor Pringle, Fortune, 30 Oct. 2025

While experts had expected another cut in December, Fed Chairman Jerome Powell said Wednesday that was no certainty. —David Lightman, Sacbee.com, 29 Oct. 2025

Such legendary figures, all fictional characters, link the messy uncertainties of nation building to a transcendent region of certainty and truth that defies criticism and doubt. —Literary Hub, 28 Oct. 2025

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