throughout; all through; right through
Emphasizes that something continues or happens during the entire duration of a specified period or event. Often used with time nouns like 一日, 会議, 旅行.
He remained silent throughout the meeting.
It rained all through the trip.
Compound of 間 (あいだ, 'interval, period') and ずっと ('continuously'). The exact historical derivation is uncertain, but it functions as a fixed adverbial phrase.