On the CyBook Gen3 you select "Lookup mode" from the menu; this gives you a "word highlight" cursor which you move up, down, left, right over the page. When the correct word is highlighted, you press the "Select" button to see the definition. It works very well. Multiple dictionaries are supported - if there's more than one "hit" you can view the definitions (either in the same or different dictionaries) one at a time.
There's a vast range of dictionaries available but, unlike the Kindle, you don't get a built-in one.
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