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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

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

Apart from its serial nature and arc, the new season/series doesn’t do anything new, doesn’t attempt to update its year 2000 operating system to 2026 standards.

From Los Angeles Times • 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

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