Crucial (5)

'crucial' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for acute that I've seen before include "Keen; severe" , "Piercing" , "Critical, serious" , "Sharp - sort of French accent" , "Sharp; severe" .)
'crucial' is the definition.
(I know that crucial can be written as vital)
This is all the clue.
(Other definitions for vital that I've seen before include "Imperative" , "Essential to life or critically important" , "Crucially important, essential" , "Desperately important" , "Essential, life-giving" .)
'crucial' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for critical that I've seen before include "All-important - disparaging" , "Disapproving; extremely ill" , "Looking for faults, like reviewer?" , "of such crucial importance" , "Book reviewer's comments may be" .)
'crucial' is the definition.
(I know that crucial can be written as all-important)
This is all the clue.
(Another definition for all-important that I've seen is " Essential, crucial".)
'crucial' is the definition.
(I know that crucial can be written as essential)
This is all the clue.
(Other definitions for essential that I've seen before include "Key" , "something necessary" , "Type of oil" , "absolutely neccessary?" , "Basic or necessary" .)
'crucial' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for momentous that I've seen before include "major" , "of great significance" .)
'crucial' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for pivotal that I've seen before include "Crucially important" , "Key" , "Central - decisive" , "Crucial, critical" , "Of central importance" .)
'crucial' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for urgent that I've seen before include "Needing immediate action" , "Important and in a hurry" , "Requiring immediate action" , "Earnest, insistent" , "To be done asap" .)