The word for today is…
perpetuity (noun):
1: eternity
2: the quality or state of being perpetual
3a: the condition of an estate limited so that it will not take effect or vest within the period fixed by law
b: an estate so limited
4: an annuity payable forever
Source : Merriam -Webster
Etymology : Continual existence—that elusive philosophical concept is reflected in perpetuity, which traces to Latin perpetuus, an adjective meaning “continual” or “uninterrupted.” The word has specific legal use. It can refer, for example, to an arrangement in a will rendering land forever incapable of being surrendered or transferred (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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