Diplomacy. [Lat., neut. pa. pple. of conclūdĕre to CONCLUDE.] (See second quot.)
1798. W. Taylor, in Monthly Rev., XXVII. 542. Ultimatums and Conclusums were crawling like wood-worms through the rotten desks of office.
1874. Blackw. Mag., CXV. Jan., 60. A Conclusum is a résumé of the demands presented by a Government. It may be discussed, and therein lies its difference with an ultimatum, which must be accepted or rejected as it stands.