(1):
(n.) The quality or state of being perpetual; as, the perpetuity of laws.
(2):
(n.) A perpetual annuity.
(3):
(n.) The number of years' purchase to be given for an annuity to continue forever.
(4):
(n.) Something that is perpetual.
(5):
(n.) 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.
(6):
(n.) Duration without limitations as to time.
(7):
(n.) The number of years in which the simple interest of any sum becomes equal to the principal.
(8):
(n.) Endless time.