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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 1998 bug in the OpenBSD operating system was one of thousands Mythos found last month.

From The Wall Street Journal • Apr. 14, 2026

An Anthropic blog post said weaknesses could be found in “every major operating system and every major web browser when directed by a user to do so.”

From Barron's • Apr. 10, 2026

Apart from its serial nature and arc, the new season/series doesn’t do anything new, doesn’t attempt to update its year 2000 operating system to 2026 standards.

From Los Angeles Times • Apr. 9, 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

I’d begun writing for a new website, Slashdot.org, an intensely geeky techno/pop-culture site devoted to the open source Linux operating system and to the open source and free software movements.

From "Geeks: How Two Lost Boys Rode the Internet Out of Idaho" by Jon Katz