operating system

noun

: software that controls the operation of a computer and directs the processing of programs (as by assigning storage space in memory and controlling input and output functions)

Examples of operating system in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Software giant Microsoft released its first copies of the Windows 98 operating system to the retail market. USA Today, 9 June 2026 Apple has also rebuilt how search works across its operating systems. Andrew Cunningham, ArsTechnica, 8 June 2026 Apple has moved Siri into a dedicated app while maintaining integration across its operating systems. Aamir Khollam, Interesting Engineering, 8 June 2026 New operating systems will allow apps to launch 30% faster, load photos 70% faster and AirDrop 80% faster, according to Apple. Mason Leath, ABC News, 8 June 2026 See All Example Sentences for operating system

Word History

First Known Use

1961, in the meaning defined above

Time Traveler
The first known use of operating system was in 1961

Browse Nearby Words

Cite this Entry

“Operating system.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/operating%20system. Accessed 12 Jun. 2026.

Kids Definition

operating system

noun
: software that controls the operation of a computer and directs the processing of the user's programs (as by controlling input and output functions)

More from Merriam-Webster on operating system

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster