(1):

(n.) The state of being insusceptible to poison, the contagion of disease, etc.

(2):

(a.) 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.

(3):

(a.) Freedom; exemption; as, immunity from error.