noun, adverb
many months; over several months
Formal or literary word for a period spanning multiple months. Often used in written contexts such as reports or formal statements.
累月にわたる調査の結果が発表された。
The results of the investigation, which spanned many months, were announced.
この問題は累月の議論を経てようやく解決した。
This issue was finally resolved after months of discussion.