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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.

His customers kept telling him that what they actually wanted was the software, and what saved Apple in the end was not the machine but the operating system inside it.

From MarketWatch • Apr. 22, 2026

The development of the Claude Mythos model by Anthropic has led to crisis meetings, after it found vulnerabilities in every major operating system and browser.

From BBC • Apr. 16, 2026

The 1998 bug in the OpenBSD operating system was one of thousands Mythos found last month.

From The Wall Street Journal • Apr. 14, 2026

Apart from its serial nature and arc, the new season/series doesn’t do anything new, doesn’t attempt to update its year 2000 operating system to 2026 standards.

From Los Angeles Times • Apr. 9, 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