imperative

名词 imperative:

1. a mood that expresses an intention to influence the listener's behavior
   同义词：imperative mood, jussive mood, imperative form
2. some duty that is essential and urgent

形容词 imperative:

1. requiring attention or action
2. relating to verbs in the imperative mood

1. It's imperative that you apologize to him immediately.
   你必须立即向他道歉。
2. Job creation has become an imperative for the government.
   创造就业机会是政府必须做的事。
3. Prompt action is imperative.
   果断的行动是必要的。

im.per.a.tive

adj.Abbr. imp.（形容词）缩写 imp.
Expressing a command or plea; peremptory:
专横的：表示命令或恳求的；不许违反的：
例句：
requests that grew more and more imperative.
越来越强制的要求

Having the power or authority to command or control.
强制的：有权力或权威去命令或控制的
Grammar Of, relating to, or constituting the mood that expresses a command or request.
【语法】 祈使的：表示或构成命令或要求语气的
Impossible to deter or evade; pressing:
必要的，紧急的：不可能防止或逃避的；紧急的：
例句：
imperative needs.See Synonyms at urgent
紧急的需要参见 urgent

n.Abbr. imp.（名词）缩写 imp.

A command; an order.
命令，要求
An obligation; a duty:
责任；义务：
例句：
social imperatives.
社会职责

A rule, a principle, or an instinct that compels a certain behavior:
驱使：迫使采取某一行为的规则、原则或本能：
例句：
a people driven to aggression by territorial imperatives.
为扩张领土的意念所驱而侵略成性的民族

Grammar
【语法】
The imperative mood.
祈使语气
A verb form of the imperative mood.
祈使语气动词

来源：
Middle English imperatif [relating to the imperative mood]
中古英语 imperatif [和祈使语气有关的]
from Old French
源自 古法语
from Late Latin imper3tovus
源自 后期拉丁语 imper3tovus
from Latin imper3tus [past participle of] imper3re [to command] * see emperor
源自 拉丁语 imper3tus [] imper3re的过去分词 [命令] *参见 emperor

【引伸】
imper.atively
adv.（副词）
imper.ativeness
n.（名词）