Most ebook readers don't allow you to choose dictionaries (if they even have one). The Kobo WiFi has a dictionary, but I have not seen any favorable posts about it. The B&N readers have a small dictionary. Sony and Kindle are the best for dictionaries. The Kindle even has a few dictionaries for sale in addition to the built-in Oxford dictionaries. If you want to test the Oxford American, it is built into the latest Kindle for PC app.
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