The Cybook and the iLiad support local dictionaries in MobiPocket format. The PRS-505 does not have dictionary lookup support.
The Kindle comes with the New Oxford American Dictionary (250,000 entries and definitions), which can be used to get definitions while reading a book. In addition, there is a search capability that will find all documents that contain a given word, its dictionary definitions, and the capability to lookup wikipedia and do a Google search on the word using its Sprint network connection. Wikipedia and Google are built in search options, but there is also a basic web browser for more custom operations.
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