im·per·a·tive
im-ˈper-ə-tiv
-ˈpe-rə-
1
: not to be avoided or evaded : necessary
an imperative duty
It is imperative that the public be informed about these dangers. = It is imperative to inform the public about these dangers.
2
a
: expressive of a command, entreaty, or exhortation
an imperative tone of voice
b
: having power to restrain, control, and direct
The democratic instinct is in France too imperative … to consider consequences …—
William C. Brownell
c
: of, relating to, or constituting the grammatical mood that expresses the will to influence the behavior of another
"Eat your vegetables!" is an imperative sentence.
imperatively
adverb
imperativeness
noun
1
: something that is imperative (see imperative entry 1): such as
c
: an obligatory act or duty
Environmental consciousness is no longer just another lifestyle choice; … it has been upgraded to a moral imperative.—
Lisa Takeuchi Cullen
e
: an obligatory judgment or proposition
2
: the grammatical mood that expresses the will to influence the behavior of another or a verb form or verbal phrase expressing it
im·per·a·tive·ness
|ivnə̇s
: the quality or state of being imperative
She felt to the full all the imperativeness of the motives which urged Will's conduct.—
George Eliot, Middlemarch, 1872
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Merriam-Webster unabridged



