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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 could find and exploit vulnerabilities in every major operating system and web browser—even when used by non-experts,” it said, foreshadowing how AI-driven cyber risks could destabilize the financial system if not managed carefully.

From The Wall Street Journal • May 8, 2026

“AI is becoming the operating system of global commerce,” Manuel said.

From The Wall Street Journal • May 7, 2026

Apple unveiled the updates to its operating system in March.

From BBC • May 5, 2026

Roku makes streaming devices and licenses its operating system to TV makers.

From Barron's • May 1, 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