\Ul`ti*ma"tum\, n.; pl. E. {Ultimatums}, L.
{Ultimata}. [NL. See {Ultimate}.]
A final proposition, concession, or condition; especially,
the final propositions, conditions, or terms, offered by
either of the parties in a diplomatic negotiation; the most
favorable terms a negotiator can offer, the rejection of
which usually puts an end to the hesitation.