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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

Google makes the other dominant smartphone operating system, Android, and builds its own Pixel smartphones that include AI features Apple can’t yet match.

From The Wall Street Journal • Mar. 19, 2026

"Mac and Windows are the operating systems for the personal computer. OpenClaw is the operating system for personal AI," Nvidia's chief executive Jensen Huang said in a statement.

From Barron's • Mar. 16, 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

‘But mine works on a different operating system from other people’s. And my wiring’s different too.’

From "The London Eye Mystery" by Siobhan Dowd

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