noun
grand undertaking; large-scale project
A somewhat formal or literary term for a major, impressive endeavor or event. Often used in written contexts such as news articles or formal speeches.
この国際会議は、まさに世紀の盛挙と言えるだろう。
This international conference can truly be called a grand undertaking of the century.
新空港建設は国家の盛挙として進められた。
The construction of the new airport was carried out as a national grand project.
Compound of 盛 (prosperous, grand) and 挙 (undertaking, action). The exact historical derivation is uncertain, but the word is used in formal written Japanese to describe large-scale, impressive projects or events.