Definition of all-important in US English:

all-important

adjective

  • Vitally important; crucial.

    ‘the town's all-important tourist industry’
    • ‘Why, without these all-important ingredients there was no romance, she insisted.’
    • ‘But, when it comes to selling a house, the grubby topic of money is all-important.’
    • ‘Friendship with oneself is all-important, because without it one cannot be friends with anyone else in the world.’
    • ‘An extra two per cent could have catapulted me from an E in chemistry to that all-important D.’
    • ‘Most of the tips are useful, such as how to maximise networking potential and where to find those all-important contacts.’
    • ‘So long as the horse was all-important in war, the upper classes were all-important, because they could ride.’
    • ‘He flew back to Mumbai on time to be with Suzanne on their all-important day.’
    • ‘Of course, the all-important marketing skill was tellingly lacking in Murthy.’
    • ‘Back then people had more to fear from a simple introduction than just screwing up the all-important first impression.’
    • ‘In many ways, such figures were all-important in helping to shape the New Left.’
    • ‘This was a man who had no intention of allowing any error to distract from his all-important evidence in defence of the Government.’
    • ‘Once or twice a couple of us even managed to sneak in and get that all-important present from the man with the white beard.’
    • ‘Seven years ago, the all-important decision to build the new centre was made - and there would be no looking back.’
    • ‘In addition, the all-important transitions between scenes were often too slow as well.’
    • ‘That ideologues can pump up small things and make them seem all-important is very old news.’
    • ‘Do, however, stay on the phone for a few seconds after the all-important beep, and sigh audibly into the receiver.’
    • ‘Therefore this is your last opportunity to make that all-important gift or cash donation to the charity.’
    • ‘So it could be an important part of a Tory manifesto, but not the all-important issue.’
    • ‘The all-important goal came ten minutes from the finish from Oliver Gordon.’
    • ‘Of course, even when we've made that all-important investment decision, it's still not finished.’
    vital, essential, indispensable, crucial, key, necessary, needed, required, requisite, important, vitally important, of the utmost importance, of great consequence, of the essence, critical, life-and-death, imperative, mandatory
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Pronunciation

all-important

/ˌôləmˈpôrtnt//ˌɔləmˈpɔrtnt/