Meaning of “immune” in the English Dictionary

"immune" in British English

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immuneadjective

uk /ɪˈmjuːn/ us /ɪˈmjuːn/

protected against a particular disease by particular substances in the blood:

Most people who've had chickenpox once are immune to it for the rest of their lives.
He seems to be immune to colds - he just never gets them.

C2 [ after verb ] not affected or upset by a particular type of behaviour or emotion:

The press had criticized her so often that in the end she had become immune (to it).

[ after verb ] not able to be punished or damaged by something:

Journalists, he insisted, must be immune (= protected) from prosecution.

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

"immune" in American English

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immuneadjective

us /ɪˈmjun/

biology protected against a particular disease or illness by particular substances in the blood:

The vaccine would make infants immune to bacteria that can cause middle ear infections.

Immune also means protected from or unable to be influenced by something, esp. something bad:

She says her mother is immune to criticism from strangers.
immunization
noun [ U ] us /ˌɪm·jə·nəˈzeɪ·ʃən/

immunization against polio

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