open-source

adjective
\ˈō-pən-ˈsȯrs \

Definition of open-source 

1 of software : having the source code freely available for possible modification and redistribution an open-source operating system

2 : of, relating to, or promoting open-source software the open-source movement/community

First Known Use of open-source

1998, in the meaning defined at sense 1

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The first known use of open-source was in 1998

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