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English definition of “mortal”

mortal

adjective uk   /ˈmɔː.təl/ us    /ˈmɔːr.t̬əl/ literary
(of living things, especially people) unable to continue living for ever; having to die: For all men are mortal. causing death: a mortal injury/illness men engaged in mortal combat (= fighting until one of them dies)figurative New computing technology dealt a mortal blow to the power of the old printing unions.
Compare
mortal dread/fear/terror extreme anxiety about or fear of someone or something: We live in mortal dread of further attacks. mortal enemy, danger, threat, etc. a very serious and dangerous enemy, danger, threat, etc.

mortal

noun [C] uk   /ˈmɔː.təl/ us    /ˈmɔːr.t̬əl/ mainly humorous
an ordinary person, rather than a god or a special, important, or powerful person: The police officers guarding the door let in the celebrities, but they prevented us lesser/mere mortals from going inside.
(Definition of mortal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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