Multiple dictionary support is a must indeed, you could have any language if it's on a Memory Stick/SD instead of all on it's internal memory (though english-english should definitely be).
It should be complete with etymology, synomnyns and even spelling, since it supports audio (that could be an optional through external memory, since it supports cards of 4GB+)
Also interesting is to be able to jump from word entry to word entry, through 'hyperlinks' in the definitions and synomnyns. And finally to have a history of all words you've looked up.
Please, dictionary, Sony!!
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