noun
A formal, somewhat literary term for an endless span of time, often with a Buddhist or philosophical flavor. In everyday speech, 永遠 (えいえん) is more common.
この苦しみが永劫に続くわけではない。
This suffering will not last for eternity.
永劫の時を経て、ようやく平和が訪れた。
After an eternity of time, peace finally arrived.