imperative
/ɪmˈperətɪv; ɪm`pɛrətɪv/ adj
1 [usu pred通常作表语]
very urgent or important; needing immediateattention 紧急; 重要; 需要立即处理
It is imperative that we make a quick decision. 我们要尽快做出决定.
2 expressing a command; authoritative 命令式的; 必须服从的; 专断的; 权威的
an imperative tone of voice that had to be obeyed 必须服从的命令腔调.
3 (grammar) of the verb form that expresses a command 祈使的
`Go!' is in the imperative mood. `Go!'是祈使语气的句子. Cf 参看 indicative, infinitive, subjunctive. imperative, n
1 (grammar) (verb in the) mood2 that expresses a command 祈使语气（的动词）
In `Go away!' the verb is in the imperative. 在`Go away!'中用的是祈使语气的动词.
`Go!' is an imperative. `Go!'是祈使语气的动词.
2 thing that is essential or urgent 必要的事; 紧急的事; 必须履行的责任; 需要; 必要性
Survival is our first imperative. 我们当务之急是设法生存下来.
a moral imperative 道德上的责任.