美 
											[ɪm'perətɪv]
																
										
							very urgent or important; needing immediate attention
expressing a command
of the verb form that expresses a command
thing that is essential or urgent
the use of the verb to express a command
																																	"as nuclear weapons proliferate, preventing war becomes imperative"
																							"requests that grew more and more imperative"
																															
She gave these orders in an imperative, hot rush of words.
出自: M. Keane