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by Derbasti 1409 days ago
What are you talking about? It's built right into the Kobo reader, and has been for years. https://help.kobo.com/hc/en-us/articles/360017639893-Define-...
1 comments

The dictionary is a built-in official feature and includes options in few different languages but CUSTOM dictionaries are not. It's possible to add dictionaries beyond what Kobo includes but it takes a little bit of work.
I missed the "custom". Sorry about that.