erudition

First attested in the 15th Century. From Middle French érudition, from Latin eruditio (“an instructing, learning, erudition”), from erudire (“to instruct, educate, cultivate”, literally “free from rudeness”), from e (“out”) + rudis (“rude”). By surface analysis, erudite + -ion.

出典: Wiktionary「erudition」（CC BY-SA 4.0）