Describes something physically or metaphorically expansive, such as land, knowledge, or generosity. Often used in formal or literary contexts.
彼は博大な知識を持っている。
He has vast knowledge.
博大な大地が目の前に広がっていた。
A vast land spread out before my eyes.
Composed of 博 (wide, extensive) and 大 (large). The exact historical derivation is uncertain, but the kanji combination directly conveys the meaning of breadth and largeness.