plural perpetuities
Definition of perpetuity
1
: eternity sense 2
2
: the quality or state of being perpetual
bequeathed to them in perpetuity
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
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Merriam-Webster unabridged
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Time Traveler for perpetuity
The first known use of perpetuity was in the 15th century
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