Kobo Glo... Eng-Eng dictionary quality?

Hello,

I went to a local eBook retailer today and came away with Kobo Glo being my number one favourite.

The only potential deal breaker is the quality of the English-English dictionary - I have read on several forums that Kobo was (is?) severely lacking in that department- definitions lack precision of Oxford dictionary and word count is very small.

Did Kobo address this shortcoming? Is it possible to install an Eng-Eng Oxford dictionary on Kobo Glo?

Thanks! :)