Etymology
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sempiternal (adj.)

"eternal and unchanging, perpetual, everlasting, having no end," early 15c., from Old French sempiternel "eternal, everlasting" (13c.) or directly from Medieval Latin sempiternalis, from Latin sempiternus "everlasting, perpetual, continual," from semper "always, ever" (see semper-). Compare aeternus from aevum (for which see eternal). Related: Sempiternally; sempiternity. The earlier Middle English adjective was sempitern (late 14c.) from Old French sempiterne and Latin sempiternus.

Trawthe is immortalle, immutable, and sempiternalle.
[Higden's "Polychronicon," 15c. translation]

Entries linking to sempiternal

semper- 
word-forming element meaning "always, ever," from Latin semper "always, ever, at all times, continuously" (literally "once for all"), from PIE *semper-, from root *sem- (1) "one; as one, together with" + *per- "during, for."
eternal (adj.)

late 14c., from Old French eternel "eternal," or directly from Late Latin aeternalis, from Latin aeternus "of an age, lasting, enduring, permanent, everlasting, endless," contraction of aeviternus "of great age," from aevum "age" (from PIE root *aiw- "vital force, life; long life, eternity").

Used since Middle English both of things or conditions without beginning or end and things with a beginning only but no end. A parallel form, Middle English eterne, is from Old French eterne (cognate with Spanish eterno), directly from Latin aeternus. Related: Eternally. The Eternal (n.) for "God" is attested from 1580s.

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Definitions of sempiternal

sempiternal (adj.)
having no known beginning and presumably no end;
sempiternal truth
Synonyms: dateless / endless
From wordnet.princeton.edu

Dictionary entries near sempiternal

semi-trailer

semi-weekly

semolina

semper-

semper idem

sempiternal

*sen-

senate

senator

senatorial

send

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