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in the PONS Dictionary

I. rationa̱l [ratsi̯o​ˈnaːl] ADJ form

1. rational Entscheidung, Wahl:

rational
racjonalny

2. rational MATH:

rational
wymierny

II. rationa̱l [ratsi̯o​ˈnaːl] ADV form

rational begründen, denken:

rational
racjonalnie