extremely or vitally important; essential.

1830–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To all-important
World English Dictionary
crucial; vital

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The first and all-important work to be done is to establish the supremacy of
  our flag.
Water is an all-important resource for human and other life.
There were all-important political considerations as well.
Reach out for advice, support, and the all-important safe place to vent.
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