(epidemiology) The indirect protection against the spread of a contagious disease in a given population caused by the immunity of a significant proportion of the population to that particular disease; the immunity may have been obtained through having survived the infection or through vaccination.

plural of sovereign immunity

(law) A legal doctrine by which the sovereign or state cannot commit a legal wrong and is immune from civil suit or criminal prosecution.

plural of crown immunity

(law) A legal doctrine by which the royal sovereign or royally governed state cannot commit a legal wrong and is immune from civil suit or criminal prosecution.

(immunology) The translocation of active humoral immunity from one individual to another in the form of custom-made antibodies.

plural of passive immunity

(biology) Any antiparasite defence mounted for the benefit of individuals other than the actor.

plural of herd immunity

(law, US) A doctrine protecting some government officials from suit if no prior court decision had declared similar conduct to be actionable, or if they acted in good faith.