The book is one of the few in-depth investigations into the nature of EU legal translation and its impact on national legal languages. It is also the first attempt to characterise EU Polish, a language of supranational law and a hybrid variant of legal Polish emerging via translation. The book applies Chesterman's concept of textual fit, that is how translations differ from non-translations, to demonstrate empirically on large corpora how the Polish eurolect departs from the conventions of legal and general Polish both at the macrostructural and microstructural level. The findings are juxtaposed with the pre-accession version of Polish law to track the 'Europeanisation' of legal Polish – recent changes brought about by the unprecedented inflow of EU translations.