n.

1. 免疫力；免疫性[U][（+against/to）]
   immunity against typhoid

   对伤寒的免疫力

2. 免除，豁免[U][（+from）]
   The law gives public schools immunity from taxation.

   法律免除公立学校的纳税义务。

3. 豁免权[U][C]
   diplomatic immunity

   外交豁免权

n.

1. the ability of an organism to resist an infection by activating an immune response.
2. exemption or protection from an obligation or penalty.