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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.
Definition of immune for English Language Learners. : 1  not capable of being affected by a disease. : 2  not influenced or affected by something. : 3  having special protection from something that is required for most people by law.