What is the grammatically accurate word or short phrase to describe a thing that has neither a beginning nor an end? Not looking for metaphors here.
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would be good I think
infinity Merriam Webster
the quality of being infinite
unlimited extent of time, space, or quantity : boundlessness
I like the word annular:
synonyms: circular, ring-shaped, disk-shaped, round;
I like eternal, but timeless is another option.
Edit. To expand a bit on my answer, a Google search shows the definition of eternal as
lasting or existing forever; without end. "the secret of eternal youth"
synonyms: everlasting, never-ending, endless, without end, perpetual, undying, immortal, deathless, indestructible, imperishable, immutable, abiding, permanent, enduring, infinite, boundless, timeless
The emphasis of the definition and most of the synonyms seem to be on the fact that it doesn't end, but does not specify that it did not begin! So I must prefer timeless, because of its obvious meaning that it's without time constraints, which would include a beginning.