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Immune response. A response from the body to an antigen that occurs when the antigen is identified as foreign and that induces the production of antibodies and lymphocytes capable of destroying the antigen or making it harmless.
The definition of immune is you are resistant to or unaffected by something harmful, especially a bacteria or disease. 1  A person who has been promised he will not be prosecuted for a crime is an example of someone who is immune to prosecution.