all-im·por·tant

[awl-im-pawr-tnt]
adjective
extremely or vitally important; essential.

Origin:
1830–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
all-important
 
adj
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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00:10
All-important is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
They put their success down to a single all-important fact: they know what they
  believe in.
Without this all-important boundary, all others are irrelevant.
Now they may not have as much money, but they are spending every day answering
  that all-important question.
Water is an all-important resource for human and other life.
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