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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.

The company says that Claude Mythos Preview managed to find high-security vulnerabilities in every major web browser and operating system, capabilities too powerful to fall into the hands of bad actors.

From The Wall Street Journal • 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

"Mac and Windows are the operating systems for the personal computer. OpenClaw is the operating system for personal AI," Nvidia's chief executive Jensen Huang said in a statement.

From Barron's • Mar. 16, 2026

The case claims the shop built into the PlayStation's operating system was designed to make players a "captive class".

From BBC • Mar. 10, 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