ALL-IMPORTANT

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 Dictionary entry overview: What does all-important mean? 

• ALL-IMPORTANT (adjective)
  The adjective ALL-IMPORTANT has 1 sense:

1. of the greatest importance

  Familiarity information: ALL-IMPORTANT used as an adjective is very rare.

 Dictionary entry details 

• ALL-IMPORTANT (adjective)

Sense 1

Meaning:

Of the greatest importance

Synonyms:

all-important; all important; crucial; essential; of the essence

Context example:

in chess cool nerves are of the essence

Similar:

important; of import (of great significance or value)

 Context examples 

But the instant that she was gone he realised how crushing a misfortune this would be for you, and how all-important it was to set it right.

(The Adventures of Sherlock Holmes, by Sir Arthur Conan Doyle)

On New Year's Eve the parlor was deserted, for the two younger girls played dressing maids and the two elder were absorbed in the all-important business of 'getting ready for the party'.

(Little Women, by Louisa May Alcott)

Read all, I pray you, with the open mind; and if you can add in any way to the story here told do so, for it is all-important.

(Dracula, by Bram Stoker)

I owe you many apologies, my dear Watson, but it was all-important that it should be thought I was dead, and it is quite certain that you would not have written so convincing an account of my unhappy end had you not yourself thought that it was true.

(The Return of Sherlock Holmes, by Sir Arthur Conan Doyle)

It was all-important.

(The Adventures of Sherlock Holmes, by Sir Arthur Conan Doyle)