Meaning of “mortal” in the English Dictionary

"mortal" in British English

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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 printing companies.
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.

mortalnoun [ C ]

uk /ˈmɔː.təl/ us /ˈmɔːr.t̬əl/ mainly humorous

(Definition of “mortal” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"mortal" in American English

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mortaladjective [ not gradable ]

us /ˈmɔr·təl/

(of living things, esp. people) unable to continue living forever; having to die:

Humans are mortal and we all eventually die.
As the ship began to sink, they realized they were in mortal danger (= they might die).

mortalnoun [ C ]

us /ˈmɔr·təl/

a human, or an ordinary person:

mere mortals

(Definition of “mortal” from the Cambridge Academic Content Dictionary © Cambridge University Press)