Etymology
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immunity (n.)

late 14c., "exemption from service or obligation," from Old French immunité "privilege; immunity from attack, inviolability" (14c.) and directly from Latin immunitatem (nominative immunitas) "exemption from performing public service or charge, privilege," from immunis "exempt, free, not paying a share" (see immune (adj.)). Medical sense of "protection from disease" is from 1879, from French or German.

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Definitions of immunity

immunity (n.)
the state of not being susceptible;
Synonyms: unsusceptibility
immunity (n.)
(medicine) the condition in which an organism can resist disease;
Synonyms: resistance
immunity (n.)
the quality of being unaffected by something;
immunity to criticism
immunity (n.)
an act exempting someone;
he was granted immunity from prosecution
Synonyms: exemption / granting immunity
From wordnet.princeton.edu