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Adjective: vital  vI-t(u)l
  1. Urgently needed; absolutely necessary
    "vital for a healthy society"; "of vital interest";
    - critical
     
  2. Performing an essential function in the living body
    "blood and other vital fluids"; "the loss of vital heat in shock"; "a vital spot"; "vital organs";
    - life-sustaining
     
  3. Full of spirit
    "a vital and charismatic leader";
    - full of life, lively
     
  4. Manifesting or characteristic of life
    "a vital, living organism"; "vital signs"

See also: alive, animated, bright-eyed, bright-eyed and bushy-tailed, essential, full of beans, indispensable, live

Encyclopedia: Vital, Abbot of Savigny