Eternity is time without an end or a state of existence outside time, especially the state that some people believe they will pass into after they have died.
双语例句
例：
I have always found the thought of eternity terrifying.
我总觉得永生的想法很可怕。
2.?[SING 单数型名词] 极长的时间
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.