Wordnet 3.0 Search
To look up the definition for a word, type your query into the box to the left and press "Search". You can choose alternate definitions/spellings by clicking definitions in the tree and on the page.
Wordnet is a free dictionary created by the Cognitive Science Laboratory at Princeton University that is based on a theory of how the brain organises words.
There are numerous semantic links between words, and nouns and verbs are arranged in an ontology that ranges from abstract ideas at the top through to specific ideas at the bottom.
Both Wordnet 3.0 and the Princeton WordNet Gloss Corpus can now be searched from this page. The Princeton WordNet Gloss Corpus links each word in the word definiton with the exact semantic definition of the word used in that context.