eter·ni·ty 
/ɪˈtɚnəti/ noun
/ɪˈtɚnəti/ noun 1 [noncount] : time without an end
▪ She promised to love him for all eternity. [=to love him forever] 2 [noncount] : a state that comes after death and never ends
▪ They believed that sinners would spend eternity in hell. 3 [singular] : time that seems to be without an end
▪ I waited (for) an eternity for my car to be fixed. ▪ We suffered through an eternity of delays during the lawsuit.
▪ She promised to love him for all eternity. [=to love him forever]
▪ They believed that sinners would spend eternity in hell.
▪ I waited (for) an eternity for my car to be fixed. ▪ We suffered through an eternity of delays during the lawsuit.
