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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.

Many analysts say Palantir isn’t as vulnerable as other software providers because it designed an operating system to integrate with a variety of AI models and can make them more useful.

From The Wall Street Journal • May 4, 2026

After the acquisition in 2010, many engineers moved over to RIM to build a mobile operating system for the BlackBerry.

From The Wall Street Journal • May 2, 2026

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

From Barron's • May 1, 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

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

From "The London Eye Mystery" by Siobhan Dowd