JLPT N1 Advanced
一大
One great; a major (prefix for significant events or undertakings)
Readings
Prefix
A Great..." / "A Major...
Functioning as a prefix, this term characterizes the attached noun as a singularly momentous or large-scale undertaking.
Example
会社 を 辞める の は 、 彼 にとって 一大 決心 だっ た 。
Quitting his job was a major decision for him.
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