noun
Refers to the start or opening of something, often used in a somewhat literary or formal context.
新しい時代の開けを告げる出来事だった。
It was an event that heralded the beginning of a new era.
noun
Used in a somewhat elevated or philosophical sense to refer to the advancement of civilization or enlightenment.
人類の開けは長い歴史の積み重ねの上にある。
Human civilization rests on the accumulation of a long history.