e ‧ ter ‧ ni ‧ ty /ɪˈtɜːnəti, ɪˈtɜːnɪti $ -ɜːr-/ BrE AmE noun
1 . an eternity a period of time that seems very long because you are annoyed, anxious etc:
Here she waited for what seemed like an eternity.
That week was an eternity of solitude and boredom.
2 . [uncountable] the whole of time without any end:
a little animal preserved for all eternity as a fossil
3 . [uncountable] the state of existence after death that some people believe continues for ever