noun, na-adjective, noun which may take the genitive case particle 'no'
erudition; extensive learning
Describes a person who has deep, wide-ranging knowledge, often from study. Can be used as a noun or adjectivally (博学な人, 博学の人).
彼は博学な人で、どんな質問にも答えてくれる。
He is an erudite person who can answer any question.
博学
Showing off one's extensive learning is not well liked.