This is the 3167th most frequent Japanese word.
博
"博" means "extensive" or "wide knowledge."
The word '博' is used here as part of '博識', signifying broad knowledge or deep understanding.
彼は歴史の博識です。
He is very knowledgeable in history.
Here, '博' appears in '博物館', referring to a museum or exhibition hall.
展示会は科学博物館で行われました。
The exhibition was held at the science museum.
In this sentence, '博' is used in '博大', indicating vastness or greatness.