I just came across this interesting project site, the Lexicon Modle for Ontologies (LEMON) website. Lemon is a proposed model for modeling lexicon and machine-readable dictionaries and linked to the Semantic Web and the Linked Data cloud. Lemon is used by Dbnary,DBpedia Wiktionary, Parole/Simple, ubyLemon, Eurosentiment and PanLex.

• RDF-native form to enable leverage of existing Semantic Web technologies (SPARQL, OWL, RIF etc.).
• Linguistically sound structure based on LMF to enable conversion to existing offline formats.
• Separation of the lexicon and ontology layers, to ensure compatability with existing OWL models.
• Linking to data categories, in order to allow for arbitrarily complex linguistic description. In particular the LexInfo vocabulary is aligned to lemon and ISOcat.

More information is here