This is the 'Basque EuroWordNet Lemon lexicon'.
The lexicon was generated from the 'Galician Word-Net-LMF lexicon' (http://lod.iula.upf.edu/resources/metadata-WordNetLMG-GL) which is
is part of the Multilingual Central Repository (MCR http://adimen.si.ehu.es/web/MCR).
The MCR integrates in the same EuroWordNet framework wordnets from five different languages: English, Spanish, Catalan, Basque and Catalan. Its format was defined during the KYOTO Project (http://www.kyoto-project.eu/).