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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.

“They don’t care about the fact that the operating system below is blah, blah, blah.”

From The Wall Street Journal • May 2, 2026

The EU on Monday laid out measures it wants Google to take to open up its operating system to rival AI services, in a move slammed by the US tech giant.

From Barron's • Apr. 27, 2026

In his view, “fully controlling both the operating system and hardware” would allow OpenAI to deliver this type of product.

From MarketWatch • Apr. 27, 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

It was so good, in fact, that it became—and remains—the operating system on which literally millions of computers around the world run.

From "Outliers" by Malcolm Gladwell