No need to open a dictionary. From any page (either the home page or within a book), simply tap the top of the screen to display the menu bar, tap search, enter your search word, and set the search location to "Dictionary". The screen will display a list of all headwords in the dictionary matching your search term. Tap one of them to display its definition.
Last edited by HarryT; 12-06-2012 at 08:18 AM.