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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.

"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

Most notably, it struggled to produce a modern multitasking operating system to replace the Mac—and eventually had to buy Next to acquire one.

From The Wall Street Journal • Mar. 6, 2026

Their Android-based operating system offers users centralised settings designed to control access to their data, with a selectable security level on a scale of one to five.

From Barron's • Mar. 4, 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

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