Etymology
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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.

updated on October 17, 2017

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Definitions of eternal from WordNet

eternal (adj.)
continuing forever or indefinitely;
eternal truths
Synonyms: ageless / aeonian / eonian / everlasting / perpetual / unending / unceasing
eternal (adj.)
tiresomely long; seemingly without end;
eternal quarreling
the wait seemed eternal
Synonyms: endless / interminable
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.