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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

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

Or maybe your brain works on a different operating system from other people’s like mine and you’ve worked it out too.

From "The London Eye Mystery" by Siobhan Dowd