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Wiktionary
open-source
  1. (context computing English) Of, or relating to a product which is licensed to permit modifications and redistribution of its source code, as per [http://opensource.org/osd The Open Source Definition]. alt. (context computing English) Of, or relating to a product which is licensed to permit modifications and redistribution of its source code, as per [http://opensource.org/osd The Open Source Definition]. v

  2. (context transitive English) To release the source code of.

WordNet
open-source

adj. of or relating to or being computer software for which the source code is freely available

Usage examples of "open-source".

York had been a Linux evangelist, trying to convince everyone in the genetics department that they should abandon Windows and switch instead to the open-source operating system.

She can see his listing on the reputation servers, hovering about thirty points above IBM: All the metrics of integrity, effectiveness and goodwill value him above even that most fundamentalist of open-source computer companies.

The Central Intelligence Agency was in the business of accumulating information, most of which would never have any practical use, and most of which, despite all manner of books and movies to the contrary, came from open-source material.