eternity - definition and synonyms

noun 

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/ɪˈtɜː(r)nəti/
  1. 1
    [uncountable] the whole of time, with no beginning and no end

    I will love you for all eternity.

    1. a.
      the idea that a person’s soul lives for ever after they die
  2. 2
    [singular] an extremely long time

    After what seemed like an eternity, he gave his answer.