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					Originally Posted by  Sao
					 
				 
				The latest firmware update for Kobo expanded the dictionary, so now it can be used on all books - Kobo epubs and sideloaded epubs. I've tested it myself and it does work.  This article talks about the latest firmware. Apparently, highlighting sideloaded epubs is also coming soon.  
			
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 Not all books, only epubs while many other e-readers support dictionaries in all text-based formats.
I would buy a kobo touch as my second reader if it supports dictionaries in all text-based formats, djvu, customized dictionaries, and word log...I like its look so much...but functionality goes first... so far it fits readers who read epubs only better.