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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.

Mythos has apparently found thousands of “high-severity vulnerabilities” in “every major operating system and web browser,” the company said.

From The Wall Street Journal • Apr. 19, 2026

"Mythos Preview has already found thousands of high-severity vulnerabilities, including some in every major operating system and web browser," Anthropic claimed on 7 April.

From BBC • Apr. 17, 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

For example, Anthropic said that in one popular operating system it tested, used by thousands of companies including Netflix and Sony, Claude Mythos found a flaw that had existed undetected for 17 years.

From Los Angeles Times • Apr. 10, 2026

Then he would come out of it, and the two would go out to dinner, then plunge into writing some program or into a long battle over which operating system was superior.

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