If you're a learner or teacher of English, you've probably installed one or more dictionary apps on your iPad. But did you know that the iPad has its own built-in dictionary? Just touch and hold any word you want to look up and select 'Define'. A box will appear with a definition and other information about the word (part of speech, pronunciation, derivatives, and origin. This works with any text which is not in image form, including emails, web pages and articles (but not The Times newspaper app). And if you're reading a book with iBooks, you also get the option to search the web or search Wikipedia.
The built-in dictionary is really excellent—and it's a lot more practical than opening a stand-alone dictionary app (some of which require an Internet connection!) to find the meaning of a word. The only thing you don't get is the audio pronun,ciation. For that you will need an app such as Dictionary.com.