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Synonyms

all-important

American  
[awl-im-pawr-tnt] / ˈɔl ɪmˈpɔr tnt /

adjective

  1. extremely or vitally important; essential.


all-important British  

adjective

  1. crucial; vital

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of all-important

First recorded in 1830–40