noun endless time.
2. perpetuity ·noun a perpetual annuity.
3. perpetuity ·noun something that is perpetual.
4. perpetuity ·noun duration without limitations as to time.
5. perpetuity ·noun the quality or state of being perpetual; as, the perpetuity of laws.
6. perpetuity ·noun the number of years' purchase to be given for an annuity to continue forever.
7. perpetuity ·noun the number of years in which the simple interest of any sum becomes equal to the principal.
8. perpetuity ·noun the quality or condition of an estate by which it becomes inalienable, either perpetually or for a very long period; also, the estate itself so modified or perpetuated.