Definitions

1. noun

A final or last warning or demand, especially one that is made as a condition of not taking further action.

“The government issued an ultimatum to the rebels, demanding that they surrender within 24 hours.”

2. noun

A statement or proposition that is regarded as the final or decisive point in an argument or discussion.

“The ultimatum made by the professor was a turning point in the debate, forcing the students to reconsider their stance.”

3. verb

To state or issue an ultimatum to (someone or something).

“The negotiator ultimatum the company’s demands to the union representatives.”