Originally Posted by tomsem
Again, Fire comes with one dictionary, and you can't add any others.
AFAIK, the Kindle offers 7 free monolingual dictionaries (en-US, en-UK, fr, it, de, es, pt-BR), some of which are downloaded on demand, and IIRC other Kindle Fire users reported that they successfully downloaded other English or French dictionaries.
So why don't you humor me and give it a shot. Just sideload my 2 very small test files to your Fire and report what happens if you try to look up the first 4 words.