Quote:
Originally Posted by trekchick
ePub doesn't define dictionary lookup, but ePub readers do support it. For example, Sony Readers come with regular British and American English dictionaries plus a dozen or so translation dictionaries to look up words in ePub or PDF documents.
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Yes, it's OK but, as I've said, ... there's world outside English language

With Mobipocket you're able to buy the dictionaries that suit better to you and to add them to your reader. And I can use the same dictionary in my Palm and my Opus, for example. If there's no spec you're tied to the manufacturer (even more than with DRM).