Why I can't use the 'define' button after updating to iOS 9.0.2? I just updated my iPhone to iOS 9.0.2, then I want to define some words. When I clicked the 'define' button, there's nothing appear. But, before I updated to iOS 9.0.2, I still can use the define button. So what should I do to allow it to define the words I want?
Go to Settings -> General -> Language &amp; Region -> and make sure the languages you want your iPhone to recognize are in the "Preferred Language Order" list.

If the language you prefer is already in that list, tap "edit" to delete the language, and then add it back up. This should add the language's dictionary and enable the "define" function.