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Definitions

operating system

[op-uh-rey-ting sis-tuhm] / ˈɒp ə reɪ tɪŋ ˌsɪs təm /
NOUN
computer software for basic operation
Synonyms
WEAK
MS-DOS MacOS OS OS/2 UNIX Windows disk operating system dos executive system software systems program

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.

Then, on its own — without human guidance or help — figured out how to use that flaw to take control of any server running the operating system, using any computer, anywhere in the world.

From Los Angeles Times • Apr. 10, 2026

Anthropic said the Mythos Preview model has already uncovered “thousands of high-severity vulnerabilities, including some in every major operating system and web browser.”

From Barron's • Apr. 8, 2026

The preview version of Anthropic’s new Mythos model “has already found thousands of high-severity vulnerabilities, including some in every major operating system and web browser,” the company said in a blog post.

From MarketWatch • Apr. 7, 2026

But each of those bodies still needs a brain - an operating system, or software, that tells the various bits of metal what to do.

From BBC • Apr. 7, 2026

Dr. Z and her army of associates had only a few days left to smooth out any kinks in the library’s complex operating system.

From "Escape from Mr. Lemoncello's Library" by Chris Grabenstein