ultimatum
//ˌʌl.tɪˈmeɪ.təm//
Noun
ultimatumSingular
ultimatumsPlural
1
A final demand or statement of terms, the rejection of which will result in retaliation or a breakdown in relations.
The company issued an ultimatum to the striking workers: return to work by Monday or face dismissal.
2
A final warning or threat, especially one given before taking drastic action.
The manager gave him an ultimatum: improve his performance or face dismissal.