WordNet普林斯顿大学研发的一款英英词典，它不仅包含了巨大的词库，而且还是免费的，对只有英汉词典的学习者来说是个很好的补充。

About WordNet

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.

Over the years, many people have contributed to the development of WordNet. Currently, the WordNet team includes the following members of the Cognitive Science Laboratory:

George A. Miller
Christiane Fellbaum
Randee Tengi
Pamela Wakefield
Rajesh Poddar
Helen Langone
Benjamin Haskell
WordNet has been supported by grants from the NSF, ARDA, DARPA, DTO, and REFLEX.