One of the most valuable resources of the english language is the dictionary. I won't get into the history of the dictionary or what it's done for literal society. I will note that incorporating inline definitions into reading apps is not the easiest thing to do. Sure, we now have eReaders like Apple's iBooks and the Amazon Kindle that have dictionary integration built in, but what about the rest of of the text-based universe?
Oxford Dictionaries is pleased to announce the launch of the Oxford Dictionaries API which, for the first time, will enable developers to access and utilize Oxford’s leading lexical content and provide a gateway to our innovative Lexical Engine and Platform (LEAP).