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You're mixing up file formats with mere extensions. A Mobi book (or dictionary) can have an extension of ".prc", ".mobi", or ".azw", and all will work equally well provided what's in the file is correct; the Kindle won't care.
If you have a dictionary, why not just try it and see?
Dictionary lookup is controlled by the language code of the book; you can't do multi-lingual dictionary lookups in a single book.
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