iBooks is free and is a good basic reading app, and simple to use. I'd start with that and if he gets frustrated with some of its weaknesses, he can look for something more sophisticated later.
You don't need to get a separate dictionary app, but you do need to download the dictionaries before he gets on the plane, or at least check that there is at least one installed (maybe there is one installed by default, I'm not sure). To do this, open a book and select a word, select definition from the local menu, and download the dictionaries you want from the list.
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