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English definition of “fatal”

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fatal

adjective uk   /ˈfeɪ.təl/ us    /-t̬əl/
B2 A fatal illness, accident, etc. causes death: This illness is fatal in almost all cases. the fatal shooting of an unarmed 15-year-oldB2 very serious and having an important bad effect 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 causes bad things to happen).
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fatally
adverb uk   /-i/ us  
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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