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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 software bug was capable of crashing an operating system used by firewalls, servers and network appliances.

From The Wall Street Journal • Apr. 14, 2026

For example, Anthropic said that in one popular operating system it tested, used by thousands of companies including Netflix and Sony, Claude Mythos found a flaw that had existed undetected for 17 years.

From Los Angeles Times • Apr. 10, 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