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in the PONS Dictionary

rationaliser [ʀasjɔnalize] VB trans

rationaliser
rationalisieren
OpenDict entry

rationaliser VB

rationaliser qc (justifier par des motifs rationnels)
rational begründen
Présent
jerationalise
turationalises
il/elle/onrationalise
nousrationalisons
vousrationalisez
ils/ellesrationalisent
Imparfait
jerationalisais
turationalisais
il/elle/onrationalisait
nousrationalisions
vousrationalisiez
ils/ellesrationalisaient
Passé simple
jerationalisai
turationalisas
il/elle/onrationalisa
nousrationalisâmes
vousrationalisâtes
ils/ellesrationalisèrent
Futur simple
jerationaliserai
turationaliseras
il/elle/onrationalisera
nousrationaliserons
vousrationaliserez
ils/ellesrationaliseront
See further verb tables