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in the PONS Dictionary

I. rationẹll [ratsi̯o​ˈnɛl] ADJ

rationell Verfahren, Methode
ekonomiczny
rationell Ausnutzung, Verwertung
racjonalny

II. rationẹll [ratsi̯o​ˈnɛl] ADV

rationell produzieren:

rationell
ekonomicznie