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in the PONS Dictionary

rationnel [ʀasjɔnɛl] N m

rationnel
Rationale(s) nt

rationnel(le) [ʀasjɔnɛl] ADJ

1. rationnel:

rationnel(le) comportement, pensée
rational
rationnel(le) alimentation
vernünftig
rationnel(le) organisation
rationell
rationnel(le) méthode, moyen
zweckmäßig
c'est un esprit rationnel
er/sie ist ein Verstandesmensch [o. ein rationaler Mensch]

2. rationnel MATH:

rationnel(le) fraction, nombre
rational