sempiternitas

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

sempĭternĭtas, ātis,f. [sempiternus],

perpetuity , eternal duration , eternity (postclass.): stabilis mundi, App. Trism. p. 94, 30; Claud. Mam. Stat. An. 1, 3; 2, 1.