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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.

Australian game developer Jon Manning said he asked Scott Forstall, then-head of Apple's mobile operating system iOS, about the phenomenon when he bumped into him in California in 2010.

From Barron's • Mar. 29, 2026

Its Basic programming language and DOS operating system weren’t innovative in the market—but became standards.

From Barron's • Mar. 13, 2026

The case claims the shop built into the PlayStation's operating system was designed to make players a "captive class".

From BBC • Mar. 10, 2026

Gen AI, in particular, will move from a co-pilot to an operating system for finance — engaging with stocks, fixed income, derivatives and other assets.

From MarketWatch • Feb. 25, 2026

The first version of the Windows operating system launched in 1985, and the breakthrough version that made IBM PCs much more user-friendly—Windows 3.0—shipped on May 22, 1990, only six months after the wall went down.

From "The World Is Flat" by Thomas L. Friedman

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.