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History
History
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Meaning:
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urgent; essential

necessary

compulsory critical crucial essential immediate important indispensable inescapable obligatory pressing urgent vital acute burning crying instant clamant clamorous exigent importunate insistent no turning back
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Cases of word usage

1) (usually imperative as a warning) to be very careful about a (bad) person, thing etc (beware)

IMPERATIVE as in Wiktionary
IMPERATIVE as in Wikipedia