Eternity is defined as, or seems like, an endless amount of time.
(noun)See eternity in Webster's New World College Dictionary
noun pl. eternities
Origin: ME eternite < OFr eternité < L aeternitas
See eternity in American Heritage Dictionary 4
noun pl. e·ter·ni·ties
Origin:
Origin: Middle English eternite
Origin: , from Old French
Origin: , from Latin aeternitās
Origin: , from aeternus, eternal; see eternal
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