e·ter·ni·ty 
(ĭ-tûrnĭ-tē)
(ĭ-tûrnĭ-tē)n. pl. e·ter·ni·ties
1. Time without beginning or end; infinite time.
2. The state or quality of being eternal.
3.
a. The timeless state following death.
b. The afterlife; immortality.
4. A very long or seemingly endless time: waited in the dentist's office for an eternity.
[Middle English eternite, from Old French, from Latin aeternitās, from aeternus, eternal; see ETERNAL.]