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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.

He also drew parallels between the current environment, when the internet was just beginning to flourish and Windows 95, a groundbreaking operating system, was first released.

From MarketWatch • May 7, 2026

Apple unveiled the updates to its operating system in March.

From BBC • May 5, 2026

As cars become computers on wheels, QNX is trusted by the world’s largest automakers because its simple, real-time operating system is designed to never, ever fail.

From The Wall Street Journal • May 2, 2026

The EU on Monday laid out measures it wants Google to take to open up its operating system to rival AI services, in a move slammed by the US tech giant.

From Barron's • Apr. 27, 2026

This is how having a funny brain that runs on a different operating system from other people’s helped me to figure out what had happened.

From "The London Eye Mystery" by Siobhan Dowd