I recently updated my iPad Pro to iOS 9.3.3 and noticed that my dictionary always gives the message "No definition found".
This might have started earlier and I just didn't notice until now.
I tried selecting Manage from the bottom left of the empty dictionary message, however, I still get the same message and no dictionaries to add.
I already tried to restore my iPad with no success.
Now I updated it to 9.3.4 and the dictionary problem isn't fixed.