The Oxford Thesaurus An A-Z Dictionary of Synonyms - immunityn.

1) exemption, non-liability, invulnerability, protection, excuse, release, exclusion, privilege, freedom, indemnity, amnesty, exoneration, absolution: In return for his testimony he was granted immunity from prosecution. 2) insusceptibility or unsusceptibility, protection, inoculation, vaccination: Immunity to a number of diseases is conferred by this one injection.