Ultimatum
Defined in 3 dictionaries — Ballentine's (1916), Black's (1910), Abbott (1879)
Ballentine's Law Dictionary
James A. Ballentine · 1916
A final proposition.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Lat. The last. The final and ultimate proposition made in negotiating a treaty or a contract or the like,
Dictionary of Terms and Phrases Used in American or English Jurisprudence
Benjamin Vaughan Abbott · 1879
The last. The last proposition made in negotiating a treaty or a contract, or the like; which may be aiccepted or rejected by the other party, but which *ill not be modified or withdrawn to be replaced by another.