/i myoohn"/ , adj.
1. protected from a disease or the like, as by inoculation.
2. of or pertaining to the production of antibodies or lymphocytes that can react with a specific antigen: immune reaction.
3. exempt or protected: immune from punishment.
4. not responsive or susceptible: immune to new ideas.
n.
5. a person who is immune.
[ 1400-50; late ME immunis exempt, equiv. to im- IM- 2 + -munis; see COMMON ]