Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Chinese dictionaries date back over two millennia to the Eastern Zhou Dynasty, which is a significantly longer lexicographical history than any other language. There are hundreds of dictionaries for Chinese, and this article will introduce some of the most important. For additional information, see Jerry Norman (1988:170-180) for an overview or Paul Fu-mien Yang totheplace(1985) for a scholarly bibliography. Adso is an open source Chinese to English dictionary and natural language processing engine for Chinese text. The Adso project started in 2001. Its gist translation and dictionary interface are online at the Adsotrans website Adsotrans. Its software and database are freely available for download at the site as well.