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A
Eternal and unchanging; everlasting — used particularly in theological and philosophical contexts to emphasise continuity without beginning or end.
— OED
B
From the Latin semper (always) and aeternus (eternal), combining two concepts of permanence into a single intensified word.
— Latin etymology
C
Distinct from merely eternal in some theological traditions, where sempiternal implies endless duration through time, while eternal implies existing outside time altogether.
— Scholastic theology
D
Used memorably by Tennyson in In Memoriam and by T.S. Eliot in Four Quartets, where it carries a solemn weight of cosmic permanence.
— Literary usage
E
The pop-rock band Bring Me The Horizon titled their 2013 album Sempiternal, a usage credited with reintroducing the word to wider popular awareness.
— Music press