/ ɪˈmjuːnəti; NAmE / noun [ U , C ] ( pl. -ies )
1.
immunity (to sth) | immunity (against sth) the body's ability to avoid or not be affected by infection and disease :
immunity to infection
The vaccine provides longer immunity against flu.
2.
immunity (from sth) the state of being protected from sth :
The spies were all granted immunity from prosecution.
parliamentary / congressional immunity (= protection against particular laws that is given to politicians)
Officials of all member states receive certain privileges and immunities.
—see also diplomatic immunity
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WORD ORIGIN
late Middle English : in the sense exemption (from a liability) ): from Latin immunitas , from immunis exempt from public service or charge, from in- not + munis ready for service.