- The quality or state of being perpetual; as, the
perpetuity of laws. - Something that is perpetual. - Endless time. - The number of years in which the simple interest of any
sum becomes equal to the principal. - The number of years' purchase to be given for an
annuity to continue forever. - A perpetual annuity. - Duration without limitations as to time. - 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.