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English definition of “open-source”

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open-source

adjective uk   /ˌəʊ.pənˈsɔːs/ us    /ˌoʊ.pənˈsɔːrs/ specialized
Open-source software is free to use, and the original program can be changed by anyone.
(Definition of open-source from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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