1
a
of software : having the source code freely available for possible modification and redistribution
an open-source operating system
b
: of, relating to, or promoting open-source software
the open-source movement/community
Instead, they opted for the open-source model, in which computer code is openly shared, allowing programmers to modify, improve and fix the software.Steve Lohr
2
a
: publicly available for use by the community at large
open-source images
The team uses open-source materials such as obituaries in local newspapers and cemetery visits for its count.Brendan Hoffman
b
: relating to or utilizing information that is publicly available
an open-source analysis
Since the advent of the internet, social media and smartphones, open-source intelligence has undergone a revolution as people willingly and publicly post vast amounts of information online. Actors outside of the traditional intelligence community have begun to take notice.Nick Waters

Examples of open-source 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.
The Act turns those concerns into model-weight security, critical safety incident reporting, support for open-source maintainers and research security. Paulo Carvão, Forbes.com, 1 July 2026 That should benefit open-source model makers such as China's DeepSeek, which have won wide adoption among startups but struggled to break into large businesses due to security concerns. Aditya Soni, USA Today, 29 June 2026 DeepSeek has said the fourth version of its open-source model is coming in two weeks. Mackenzie Sigalos, CNBC, 29 June 2026 Microsoft is also exploring hosting open-source models like China’s DeepSeek, as first reported by Axios. Sebastian Herrera, Fortune, 27 June 2026 See All Example Sentences for open-source

Word History

First Known Use

1956, in the meaning defined at sense 2

Time Traveler
The first known use of open-source was in 1956

Cite this Entry

“Open-source.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/open-source. Accessed 7 Jul. 2026.

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