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The Collaborative International Dictionary
Sempiternity

Sempiternity \Sem`pi*ter"ni*ty\, n. [L. sempiternitas.] Future duration without end; the relation or state of being sempiternal.
--Sir M. Hale.

Wiktionary
sempiternity

n. (context philosophy English) existence within time but infinitely into the future; as opposed to eternity, understood as existing outside time

WordNet
sempiternity

n. the property of being perpetual (seemingly ceaseless) [syn: perpetuity]