Wordia - The Definition Of Immunity
immunity
noun, the ability of an organism to resist disease, either through the activities of specialized blood cells or antibodies produced by them in response to natural exposure or inoculation (active immunity) or by the injection of antiserum or the transfer of antibodies from a mother to her baby via the placenta or breast milk (passive immunity). See also acquired immunity, natural immunity
From Collins
©HarperCollins 2008. Collins English Dictionary definition of immunity