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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 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

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

BlackBerry BB 1.03%increase; green up pointing triangle laid out its fiscal 2027 growth outlook after reporting a fourth-quarter profit, supported by robust revenue from its QNX real-time operating system segment.

From The Wall Street Journal • Apr. 9, 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

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