OntoLex-Lemon Lexicon Model
W3C model for lexical information relative to ontologies. Standard for linguistic linked data publishing.
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Where this one tends to earn its keep.
Machine-readable dictionary publishing
Multilingual lexicon linked data
Wordnet-to-RDF conversion
Terminological resource integration
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in NLP & Linguistics.