fatal Definition in the Cambridge English Dictionary
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Definition of “fatal” - English Dictionary

Definition of "fatal" - American English Dictionary

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fataladjective [not gradable]

 us   /ˈfeɪ·t̬əl/
(of ​illness, ​accidents, etc.) causing ​death: a fatal ​heartattack Fatal can also ​meansevere enough to ​produce a very ​badresult: a fatal ​mistake/​flaw
fatally
adverb [not gradable]  us   /ˈfeɪ·t̬əl·i/
Several ​people were ​injured, two fatally.
(Definition of fatal from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "fatal" - British English Dictionary

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fataladjective

uk   /ˈfeɪ.təl/  us   /-t̬əl/
B2 A fatal ​illness, ​accident, etc. ​causesdeath: This ​illness is fatal in ​almost all ​cases. the fatal ​shooting of an ​unarmed 15-year-oldB2 very ​serious and having an ​importantbadeffect in the ​future: He made the fatal mistake/​error of ​believing what they told him. It just ​shows how you should never say how well things are going for you - it's fatal (= it ​causesbad things to ​happen).
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fatally
adverb uk   us   /-i/
Several ​people were ​injured, two fatally (= they ​died as a ​result).
(Definition of fatal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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