iOS 6 (and above) now allow you to get dictionaries in multiple dictionaries, so this workaround is no longer necessary unless you're on an iPad 1 (other device that does not support iOS 6) or looking for an unusual language that iBooks does not support. It does not seem like iOS6 uses the same dictionary management as iOS 3/4/5 at all, so the mechanism written below will not work. You will probably also need a jailbroken iOS 6 device to modify anything. === For readers on iOS 5 and below === Is it possible to get the iBooks dictionary to work in languages other than English? Like can I change it or add on a French dictionary, in particular? Switching to the Collins app every time I want to translate a word is getting irritating. Yes, it is possible, see below post for how I did it without disrupting the definitions available by default for Japanese and English. NOTE: YOU DO NOT NEED A JAILBROKEN iOS DEVICE FOR THIS TO WORK, YOU CAN USE iEXPLORER OR SIMILAR.