Ultimatum (noun)

A final demand or statement of terms, the rejection of which may lead to a severance of relations or to the use of force.

Origin:

Late 18th century: from latin, literally "final statement", from ultimus "last".

Examples:

1. The government gave the rebel group an ultimatum to lay down their arms.
2. The company gave its employees an ultimatum to accept the new contract or face termination.
3. The ultimatum was a demand for the immediate withdrawal of troops from the country.
4. The ultimatum was a final warning before action would be taken.
5. The ultimatum was a last ditch effort to resolve the dispute.