When reading books I use the dictionaries a LOT, but I've not been too happy with the pair of Oxford dictionaries. According to this link: http://www.amazon.com/Merriam-Websters-Collegiate-Dictionary-Edition-ebook/dp/B000SEGJ5S/ref=sr_1_1?s=digital-text&ie=UTF8&qid=1356908208&sr=1-1&keywords=webster+dictionary+for+kindle the Merriam-Webster's Collegiate Dictionary is supposed to be compatible with the HD 7", so I purchased it and downloaded it to my Fire. But I haven't been able to get it to automatically be used when selecting a word in a book I'm reading. Can anyone help? Thanks!