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It's pretty simple.
An ereader's main function is to display words.
Words have meanings and uses.
Nobody knows every word and every usage.
also:
Ereaders are capable of storing a full dictionary without compromising other features.
It's a great selling point.
Some readers read in a 2nd language.
Some books use obscure words or usages.
A dictionary doesn't impact on a user who doesn't use it.
I find it hard to believe that anybody would not understand that a dictionary on an ebook reader is a no-brainer.
I get a fair amount of use out of mine from reading mythology books from the late 1800s and early 1900s (obscure words) and from reading scientific/academic books (technical terms).
An electronic dictionary is another way that ebooks are superior to paper books. If I need to look up a word there is less effort required. When reading a paper book on the bus I'm not going to be carrying a dictionary with me (or even get out my phone and do a search). On an ereader a definition is a few clicks away.
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