imperative

[im-per-uh-tiv]
adjective
1.
absolutely necessary or required; unavoidable: It is imperative that we leave.
2.
of the nature of or expressing a command; commanding.
3.
Grammar. noting or pertaining to the mood of the verb used in commands, requests, etc., as in Listen! Go! Compare indicative ( def 2 ), subjunctive ( def 1 ).
noun
4.
a command.
5.
something that demands attention or action; an unavoidable obligation or requirement; necessity: It is an imperative that we help defend friendly nations.
6.
Grammar.
a.
the imperative mood.
b.
a verb in this mood.
7.
an obligatory statement, principle, or the like.

Origin:
1520–30; < Late Latin imperātivus, equivalent to Latin imperāt(us) past participle of imperāre to impose, order, command (im- im-1 + -per- (combining form of parāre to fur-nish (with), produce, obtain, prepare) + -ātus -ate1) + -īvus -ive

imperatively, adverb
imperativeness, noun
nonimperative, adjective
nonimperatively, adverb
nonimperativeness, noun
unimperative, adjective
unimperatively, adverb

imperative, imperial, imperious.


1. inescapable; indispensable, essential; exigent, compelling.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
imperative (ɪmˈpɛrətɪv)
 
adj
1.  extremely urgent or important; essential
2.  peremptory or authoritative: an imperative tone of voice
3.  grammar Also: imperatival denoting a mood of verbs used in giving orders, making requests, etc. In English the verb root without any inflections is the usual form, as for example leave in Leave me alone
 
n
4.  something that is urgent or essential
5.  an order or command
6.  grammar
 a.  the imperative mood
 b.  a verb in this mood
 
[C16: from Late Latin imperātīvus, from Latin imperāre to command]
 
im'peratively
 
adv
 
im'perativeness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

imperative
1530, from L.L. imperativus "pertaining to a command," from imperatus "commanded," pp. of imperare "to command, to requisition," from in- "in" + parare "beget, bear" (see pare).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

imperative definition


A grammatical category describing verbs that command or request: “Leave town by tonight”; “Please hand me the spoon.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Pride obviously had something to do with this, but pride compounded by the
  imperatives of a dueling society.
But the book was much more than a fairy tale unshackled from moralistic
  imperatives and tired fantastical creatures.
Their mutual influence sloshes back and forth, each responding to each other as
  well as their own imperatives.
The result is a misalignment between the emerging imperatives of smart business
  and the lagging sensibilities of old laws.
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