What it means
再び means “again” or “once more” and indicates that an action, event, or state is occurring after it happened previously. It is an adverb and usually appears before the verb or predicate it modifies. Compared with もう一度, 再び is more formal and is especially common in writing, announcements, reports, and serious or literary contexts. It can describe either a repeated action or the return of a previous state.
Usage note
再び is grammatically usable in both familiar and polite sentences, but its formal tone can sound less casual than もう一度 in everyday conversation.
How to use it
この地域の産業は再び成長します。
The industry in this region will grow again.
この地域の産業は再び成長する。
The industry in this region will grow again.
Example sentences
改修工事が終わり、駅前の広場は再び市民の憩いの場となった。
The renovation work ended, and the plaza in front of the station once again became a place of relaxation for citizens.
台風が通り過ぎた後、離島へのフェリーは再び運航を始めた。
After the typhoon passed, the ferry to the remote island began operating again.