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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.

Entrata says 2.5 million units are enrolled in its operating system, but the company offers a suite of property-management services beyond RentPlus, including payment processing and rental insurance.

From MarketWatch • Jun. 2, 2026

The operating system stayed embedded in retail, banking, healthcare, energy, law enforcement and defense systems long after it should have been retired.

From MarketWatch • May 27, 2026

The frames will operate on Google’s Gemini AI model and work with Android’s “extended reality” operating system to provide contextual, real-time assistance.

From Barron's • May 19, 2026

Palantir has become the operating system for the Defense Department.

From The Wall Street Journal • May 9, 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

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