eternity
/ɪˈtɜːnətɪ/noun
( pl. -ies)［mass noun］
1- infinite or unending time无穷无尽的时间：
their love was sealed for eternity
他们之间的爱情已经敲定, 再也不会改变了
this state of affairs has lasted for all eternity.
这种事态无限期地持续着。
1.1
- a state to which time has no application; timelessness永恒。
1.2
- Theology endless life after death【神学】永生：
immortal souls destined for eternity.
注定会永生的不朽灵魂。
1.3
- used euphemistically to refer to death〈婉〉死：
he could have crashed the car and taken them both to eternity.
他本可以把车撞毁, 带着两人一起去见阎王。
1.4
an eternity
informal a period of time that seems very long, especially on account of being tedious or annoying〈非正式〉（尤指因冗长乏味或恼人而）显得无止境的长时间：a silence that lasted an eternity.
似无止境的长时间沉默。
词源
late Middle English: from Old French eternite, from Latin aeternitas， from aeternus 'without beginning or end' （see ETERNAL）.