eternity

1 endless time the question whether the universe will end someday or continue to exist in eternity Synonyms everlasting, foreverness, infinity, perpetuity Related Words boundlessness, endlessness, interminableness, limitlessness, permanence, permanency, timelessness Near Antonyms ephemerality, impermanence, temporariness, transience, transitoriness

2 unending existence after death a firm belief in the eternity of the soul Synonyms afterlife, beyond, hereafter, immortality Related Words afterworld, otherworld

3 a long or seemingly long period of time we waited in line for tickets for an eternity Synonyms aeon (or eon), blue moon, coon's age, cycle, donkey's years [chiefly British], age, forever, long, months, moonRelated Words infinity; lifetimeNear Antonyms flash, instant, jiffy, minute, moment, second, shake, split second, trice, twinkle, twinkling, wink; microsecond, nanosecond