WordNet

From the WordNet home page:

"WordNet is a large lexical database of English, developed under the direction of George A. Miller. Nouns, verbs, adjectives and adverbs are grouped into sets of cognitive synonyms (synsets), each expressing a distinct concept. Synsets are interlinked by means of conceptual-semantic and lexical relations. The resulting network of meaningfully related words and concepts can be navigated with the browser. WordNet is also freely and publicly available for download. WordNet's structure makes it a useful tool for computational linguistics and natural language processing."

The original WordNet

• WordNet
• Links to related projects - links given on the Princeton WordNet website

Extensions to WordNet

• eXtended WordNet - glosses are syntactically parsed, transformed into logic forms, and content words are semantically disambiguated
• SentiWordNet - assigns to each synset of WordNet three sentiment scores: positivity, negativity, objectivity
• WordNet Domains - augmented with Domain Labels, such as POLITICS, ECONOMY, SPORT

WordNet in other languages

• EuroWordNet - search for EuroWordNet in the catalogue search engine
• MultiWordNet