imperative has definitions from the fields of sociology,grammar
1
[ adjective ] requiring attention or action

Examples

"as nuclear weapons proliferate, preventing war becomes imperative" "requests that grew more and more imperative"

Used in print

(Bonnie Prudden, "The Dancer and the Gymnast"...)

It is very important for parents to understand that early training is imperative .

(William S. Haymond, "Is Distance an Original...)

Obviously , a satisfactory answer to the third question is imperative , if the argument is to get under_way at_all , for if there is any possibility of doubt whether the patient 's tactual sensitivity had been impaired by the occipital lesion , any findings whatsoever in regard_to the first question become completely ambiguous and fail altogether , of_course , as evidence to establish the desired conclusion .

2
[ noun ] (grammar) a mood that expresses an intention to influence the listener's behavior

Related terms

mood

3
[ adjective ] (grammar) relating to verbs in the imperative mood

Related terms

grammar imperative_mood

4
[ noun ] (sociology) some duty that is essential and urgent

Related terms

duty

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