something that demands attention or action; an unavoidable obligation or requirement; necessity: It is an imperative that we help defend friendly nations.
the imperative mood.
a verb in this mood.
an obligatory statement, principle, or the like.
Origin of imperative
1520–30; < Late Latinimperātivus, equivalent to Latinimperāt(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
Related formsim·per·a·tive·ly, adverbim·per·a·tive·ness, nounnon·im·per·a·tive, adjectivenon·im·per·a·tive·ly, adverbnon·im·per·a·tive·ness, nounun·im·per·a·tive, adjectiveun·im·per·a·tive·ly, adverbCan be confusedimperativeimperialimperious
peremptory or authoritativean imperative tone of voice
Also: imperatival (ɪmˌpɛrəˈtaɪvəl) grammardenoting 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
1520s, from Late Latin imperativus "pertaining to a command," from imperatus "commanded," past participle of imperare "to command, to requisition," from assimilated form of in- "into, in" (see in- (2)) + parare "prepare" (see pare).
mid-15c., in grammar; later "something imperative" (c.1600), from Old French imperatif and directly from Late Latin imperativus (see imperative (adj.)).