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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.

Google and iPhone-maker Apple are among operating system developers offering them as an alternative way users can sign into accounts.

From BBC • Apr. 24, 2026

It also unveiled an operating system called Kaka Claw, aimed at powering in-vehicle features, including voice interaction and other smart controls.

From The Wall Street Journal • Apr. 23, 2026

His customers kept telling him that what they actually wanted was the software, and what saved Apple in the end was not the machine but the operating system inside it.

From MarketWatch • Apr. 22, 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

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