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Adjective: important  im'por-t(u)nt
  1. Of great significance or value
    "important people"; "the important questions of the day";
    - of import
  2. Important in effect or meaning
    - significant
  3. Of extreme importance; vital to the resolution of a crisis
    - crucial
  4. Having authority, ascendancy or influence
    "an important official";
    - authoritative
  5. Having or suggesting a consciousness of high position
    "recited the decree with an important air"; "took long important strides in the direction of his office"

See also: all important, all-important, alpha, beta, big, burning, cardinal, central, chief, climacteric, consequential, Copernican, critical, crucial, decisive, distinguished, earthshaking, earth-shattering [informal], epochal, epoch-making, essential, eventful, evidential, evidentiary, fundamental, grand, grave, great, grievous, heavy, historic, immodest, imperative, importance, in-chief, influential, key, large, life-and-death, life-or-death, main, master, meaningful, measurable, momentous, monumental, most-valuable, notable, noteworthy, of the essence, operative, outstanding, paramount, pivotal, polar, portentous, primal, primary, principal, probative, probatory, prodigious, profound, remarkable, serious, significance, strategic, valuable, weighty, world-shaking, world-shattering

Antonym: insignificant, noncrucial

Encyclopedia: Important