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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.

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 its new model already has found thousands of high-severity vulnerabilities, including some in every major operating system and web browser.

From The Wall Street Journal • Apr. 8, 2026

But each of those bodies still needs a brain - an operating system, or software, that tells the various bits of metal what to do.

From BBC • Apr. 7, 2026

Networking giants Cisco and Broadcom are taking part in the project, along with the Linux Foundation that promotes the free, open-source Linux computer operating system.

From Barron's • Apr. 7, 2026

I’d been able to coax it back to life by replacing its system memory and reloading the stone-age operating system.

From "Ready Player One: A Novel" by Ernest Cline