Eternity is time without an end or a state of existence outside time, especially the state which some people believe they will pass into after they have died.
例句
I have always found the thought of eternity terrifying.我向來覺得永生的想法很可怕。...laying him to rest for all eternity.讓他永遠安息
N-SING
極長的一段時間;似乎無窮盡的一段時間
If you say that a situation lasted for an eternity, you mean that it seemed to last an extremely long time, usually because it was boring or unpleasant.
例句
The war continued for an eternity...那場戰爭持續了極長的一段時間。The ringing went on for what seemed an eternity, and then someone answered.電話響了似乎很長一段時間，然后有人接了電話。
英漢詞典釋義
n.
永恒
God will live for all eternity.上帝是永存的。
似乎相當長的一段時間
He waited for an eternity.他無盡期地等待著。
英英詞典釋義
Noun
1. time without end
2. a state of eternal existence believed in some religions to characterize the afterlife