American English

Definition of fatal adjective from the Oxford Advanced American Dictionary



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  1. 1causing or ending in death a fatal accident/blow/illness a potentially fatal form of cancer If she gets sick again, it could prove fatal. compare mortal
  2. 2causing disaster or failure a fatal error/mistake Any delay would be fatal. There was a fatal flaw in the plan. It would be fatal to try and stop them now.
adverb fatally injured/wounded The plan was fatally flawed from the start.
See the Oxford Advanced Learner's Dictionary entry: fatal