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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

IBM’s own guidance suggested that 10% growth is likely the ceiling through 2026, largely due to slowing demand for its core product, the Red Hat Enterprise Linux operating system.

From Barron's • Jun. 1, 2026

Researchers with security firm Calif found two bugs in Apple’s desktop operating system, using techniques from Anthropic’s Mythos AI.

From The Wall Street Journal • May 14, 2026

This includes the little green robot that Google uses as the mascot for its Android mobile operating system.

From BBC • May 13, 2026

My brain runs on a different operating system from other people’s.

From "The London Eye Mystery" by Siobhan Dowd

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