C formal something that is very important and urgent 紧迫的事；紧要之物
a moral/political/economic imperative (=something that must be done because it is right) Solidarity between rich and poor nations is a moral imperative. 道义上/政治上/经济上必须做的事
2
singular linguistics the form of a verb that expresses orders. The imperative is also called the imperative mood . 祈使语气