Etymology
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Words related to eternal

*aiw- 

also *ayu-, Proto-Indo-European root meaning "vital force, life; long life, eternity."

It forms all or part of: age; aught (n.1) "something; anything;" aye (adv.) "always, ever;" Ayurvedic; coetaneous; coeval; each; eon; eternal; eternity; ever; every; ewigkeit; hygiene; longevity; medieval; nay; never; no; primeval; sempiternal; tarnation; utopia

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit ayu- "life;" Avestan aiiu "age, life(time);" Greek aiōn "age, vital force; a period of existence, a lifetime, a generation; a long space of time," in plural, "eternity;" Latin aevum "space of time, eternity;" Gothic aiws "age, eternity," Old Norse ævi "lifetime," German ewig "everlasting," Old English a "ever, always."  

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coeternal (adj.)

also co-eternal, "existing with another for eternity," late 14c., from Medieval Latin, from Late Latin coaeternus; see co- + eternal.

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]
tarnation (n.)
1784, American English alteration of darnation (itself a euphemism for damnation), influenced by tarnal (1790), a mild profanity, clipped from phrase by the Eternal (God) (see eternal).