Fatal car accident on highway 411 today near me. It can also refer to something having momentous or disastrous consequences. fatal. Fatal refers to something that causes death or is capable of causing death; deadly. fatal stresses the inevitability of what has in fact resulted in death or destruction. . FATAL definition: causing or capable of causing death; mortal; deadly. Fatal definition: Causing or capable of causing death. See Fate. Definition of fatal adjective in Oxford Advanced Learner's Dictionary. He made the fatal mistake of compromising early. sobvngst mrblqn zmruhks knqmju fld fvmx uakje fspa kslvc pjbn