WordReference Random House Unabridged Dictionary of American English © 2017
all-im•por•tant  (ôlim pôrtnt),USA pronunciation adj. 
  1. extremely or vitally important;
    essential.
  • 1830–40


Collins Concise English Dictionary © HarperCollins Publishers::

all-important adj
  1. crucial; vital



'all-important' also found in these entries:
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