Lewis Short
(v. n.Subst.) : post-sum (also separate, post sum), fui, esse, v. n.
* To be after or future; in tmesi: qui ignominias sibi post putavit esse prae meo commodo,Ter. Ad. 2, 3, 9. —Subst.
* Postfŭtūri, ōrum, m., those yet to be, posterity: quia solus omnium post memoriam humani generis subplicia in post futuros composuit,Sall. H. 1, 41, 6 Dietsch.
* Postfŭtūrum, i, n., that which is to be, the future: duplicare obituri dolorem etiam post futuri aestimatione,Plin. 7, 55, 56, § 190: in post futurum,for the future,id. ib.: tum videbitur lex in postfuturum loqui,Gell. 17, 7, 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary