The Collaborative International Dictionary of English v.0.48:
Immunity \Im*mu"ni*ty\, n.; pl. Immunities. [L. immunitas, fr.
immunis free from a public service; pref. im- not + munis
complaisant, obliging, cf. munus service, duty: cf. F.
immunit['e]. See Common, and cf. Mean, a.]
1. Freedom or exemption from any charge, duty, obligation,
office, tax, imposition, penalty, or service; a particular
privilege; as, the immunities of the free cities of
Germany; the immunities of the clergy.
2. Freedom; exemption; as, immunity from error.
3. The state of being insusceptible to disease, certain
[Webster 1913 Suppl.]