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in the PONS Dictionary

rationalization [ˌræʃənəlaɪˈzeɪʃən, Am -lə-] N no pl

1. rationalization (explanation):

rationalization
uzasadnienie nt
rationalization
wytłumaczenie nt

2. rationalization (improvement):

rationalization
racjonalizacja f
rationalization
usprawnienie nt

rationalization investment N ECON

rationalization investment
inwestycje fpl mające na celu udoskonalenie produkcji