Thank you all for your responses. Here's more specific info for the Sonys (EUROPEAN VERSION - US/CANADA COMES WITH LESS)
PRS-T2
NEW OXFORD AMERICAN DICTIONARY
OXFORD DICTIONARY OF ENGLISH
OXFORD HACHETTE FR-EN
COLLINS DE-EN
OXFORD SPANISH EN-ES (have this and it is superb)
COLLINS EN-IT (have this, very good)
VAN DALE POCKETWOORDENBOEK NL-EN
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PRS-T3 - ALL THE ABOVE, PLUS THREE ADDITIONAL MONOLINGUALS (DE, FR, ES):
DUDEN-WISSENSNETZ DEUTSCHE SPRACHE
MULTIDICTIONNAIRE DE LA LANGUE FRANÇAISE
DICCIONARIO GENERAL DE LENGUA ESPAÑOLA VOX
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I might be mistaken, but this is my current understanding of Kindle e-readers: The devices include one or more monolingual dictionaries for each of the supported menu languages,
English, Spanish, Brazilian Portuguese, French, German, Italian, Japanese and Simplified Chinese,
but that is it. Additional dictionaries can be added, but must be purchased. I believe the English monolinguals are the same as Sony's. I think the Spanish is Diccionario de la Real Academia, and I can't remember the rest. The monolinguals are indeed very good.
It would be great if someone with a European Kindle could provide a quick list of exactly what dictionaries came installed in their device. It infuriates me that none of these vendors provide this specific information.