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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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    eternal: 1. Being without beginning or end (thefreedictionary.com/eternal) Commented Oct 10, 2014 at 5:34
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    "Limitless", "boundless" and "infinite" come to mind. In the temporal domain, "eternal".
    – Amadan
    Commented Oct 10, 2014 at 5:34
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    It's not possible to answer your question, unless you exactly explain what you are referring to. For example, is this about a cartesian line in math, or is it about a physics or cosmology matter, or concerning perhaps work or .. ?
    – Fattie
    Commented Oct 10, 2014 at 7:28
  • The term 'grammatically accurate' is imprecise here at best. Commented Oct 10, 2014 at 8:12
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    @araucaria True. In fact, a Möbius strip has no end twice! Commented Oct 10, 2014 at 17:09

4 Answers 4

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boundless

would be good I think

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infinity Merriam Webster

the quality of being infinite
unlimited extent of time, space, or quantity : boundlessness

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  • The set of all positive numbers (or all non-negative numbers) is infinite, but it has a beginning. Conversely (as mentioned in a comment), a circle has no beginning or end, but is finite. Commented Oct 14, 2014 at 23:33
  • I think 'infinite' might be better in this usage, rather than 'infinity'. Commented Nov 23, 2015 at 1:45
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I like the word annular:

an·nu·lar ˈanyələr

ring-shaped.

synonyms: circular, ring-shaped, disk-shaped, round;

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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.

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  • @choster, thanks for the welcome. I will expand my answer according to your advice. Commented Nov 23, 2015 at 6:40

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