Thanks very much for the helpful reactions; yes doing some research beforehand is necessary - but very difficult indeed as most product-descriptions don't even mention dictionaries or, if they do, are very vague about them. A pity none of the answers here comments on the second part of my question, about the way dictionaries are used. Having to open a dictionary and typing in a word on the touch-screen keyboard is not my idea of 'user-friendly'. In contrast, on my device I simply tap on a word while reading a book and a short entry from the 'standard' dictionary (explanation or translation) appears in a window underneath the page. One more tap expands the entry to full page and allows changing the dictionary (while still retaining the same word-entry).
What I am still unsure about is whether other readers allow the same ease of use, with built-in or user-added dictionaries.
(By the way: there is just no way at all I could have known beforehand which dictionaries would come with my Sony. This is especially annoying in Europe - but that's another story.)
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