What does eternal mean?
Eternal describes something that lasts forever, having neither beginning nor end. It appears most often in religious and philosophical contexts — eternal life, eternal truths, the eternal nature of the universe — where it conveys a sense of the absolute and unchanging. Beyond this literal sense, English speakers frequently use the word hyperbolically: an 'eternal wait' at the airport or someone's 'eternal optimism' simply means it feels endless. The word derives from Latin aeternus, rooted in aevum meaning 'age' or 'lifetime', which also gave us words like medieval and coeval. Its synonyms include everlasting, perpetual, and timeless, though each carries slightly different shades of meaning — 'timeless' suggests freedom from time's effects, while 'perpetual' can imply tiresome continuity. As an adjective with strong emotional resonance, eternal lends weight to vows, memorials, and declarations of love, making it one of English's most enduringly expressive words.
Lasting or existing forever; without beginning or end.
"The philosopher contemplated whether any truth could truly be called eternal."
Continuing indefinitely; used hyperbolically of something that seems never-ending.
"After the eternal delay, the train finally pulled into the station."
This figurative sense is typically informal and often expresses mild frustration or humor.
Rome has been called 'the Eternal City' for over two thousand years — a nickname so old that even the ancient Romans who coined it were already looking back on a long history.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of eternal
Eternal comes from Latin aeternus, meaning 'of endless duration', formed on aevum ('age, lifetime, eternity'), which traces back to the Proto-Indo-European root *aiw- relating to vital force and long life. The word entered Middle English via Old French around the late 14th century. It shares its deep root with words such as medieval, coeval, primeval, and longevity, all of which involve notions of age or duration through Latin derivatives of *aiw-.
Related word forms
How eternal is actually used
Register-neutral and common in both formal and everyday contexts. The literal sense carries solemn, elevated connotations (religion, philosophy, love poetry), while the figurative sense is often mildly humorous or exasperated, as in 'his eternal questions'. Capitalized as 'the Eternal', it can function as an epithet for God.
Easily confused with eternal
'Internal' means situated or existing within something, while 'eternal' means lasting forever — the two look and sound similar but are unrelated in meaning.
'External' means belonging to the outside or outer part of something, whereas 'eternal' refers to endless duration in time.