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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 development of the Claude Mythos model by Anthropic has led to crisis meetings, after it found vulnerabilities in every major operating system and browser.

From BBC • Apr. 16, 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

On the other side of the business, BlackBerry’s QNX real-time operating system for cars, robots, and other physical machinery has become the company’s core growth driver.

From Barron's • Apr. 9, 2026

‘But mine works on a different operating system from other people’s. And my wiring’s different too.’

From "The London Eye Mystery" by Siobhan Dowd