immunity /imyo̅o̅″nitē/ [L, immunis, free from] , 1. (in civil law) exemption from a duty or an obligation generally required by law, as an exemption from taxation or from penalty for wrongdoing or protection against liability. 2. the quality of being insusceptible to or unaffected by a particular disease or condition. Kinds include acquired immunity, active immunity, passive immunity. −immune, adj.