noun, adverb
night; nighttime
Often used in compound nouns and formal or official contexts, such as 夜間営業 (nighttime business hours) or 夜間飛行 (night flight). As an adverb, it means 'at night' or 'during the night'.
この店は夜間も営業しています。
This shop is open at night as well.
夜間の外出は危険です。
Going out at night is dangerous.