The word for today is…
perpetuity (noun):
1 : eternity
2 : the quality or state of being perpetual
3: the condition of an estate limited so that it will not take effect or vest within the period fixed by law
4 : an annuity payable forever
Source : Merriam -Webster
Etymology : Continual existence—that elusive concept has made perpetuity a favorite term of philosophers and poets for centuries. The word derives ultimately from the Latin adjective perpetuus (“continual” or “uninterrupted”), which is also the source of our perpetual and perpetuate. It frequently occurs in the phrase “in perpetuity,” which essentially means “forever” or “for an indefinitely long period of time.” Perpetuity also has some specific uses in law. It can refer to an arrangement in a will rendering land forever inalienable (or at least, for a period longer than is set by rules against such arrangements) or to an annuity that is payable forever.
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