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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

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

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

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