The story
- Latin · derived fromrationalis“reasonable”
- Late Latin · derived fromrationalitas“rationality, reasonableness”
- French · derived fromrationalité
- English todayrationality
From rational + -ity, from French rationalité, from Late Latin rationalitas (“rationality, reasonableness”), from Latin rationalis (“reasonable”).
Words from the same roots
Latinrationalis all →
rationalrational number
Etymology from Wiktionary, CC BY-SA 4.0.