1. infinite or unending time: "their love was sealed for eternity"Similareverall timeperpetuity
▪ a state to which time has no application; timelessness: "the encounter between time and eternity"
▪ endless life after death: "immortal souls destined for eternity"Similarthe afterlifeeverlasting lifelife after deaththe life to comethe life hereafterthe hereafterthe world hereafterthe afterworldthe next worldthe beyondheavenparadisenirvanaimmortalityOppositelimbohell
▪ used euphemistically to refer to death: "he could have crashed the car and taken them both to eternity"
▪ a period of time that seems very long, especially on account of being tedious or annoying:"a silence that lasted an eternity"Similara long timean ageages (and ages)a timea lifetimehoursdaysmonthsyearsaeonshours/days/months on enda month of Sundaysthe duration(seemingly) foreverinformal:yonksdonkey's yearsOppositeinstant
Word Originlate Middle English: from Old French eternite, from Latin aeternitas, from aeternus ‘without beginning or end’ (see eternal).