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Adaptive Immunity Definition. Adaptive immunity is an important part of the immune system. It is protection from an infectious disease agent that is mediated by B-and T-lymphocytes following exposure to specific antigen, and characterized by immunological memory.
Webster Medical Dictionary. â¢ Innate Immunity: Immunity that is naturally present and is not due to prior sensitization to an antigen; generally nonspecific. It is in contrast to acquired/adaptive immunity.â¢ Innate Immunity: Immunity that is naturally present and is not due to prior sensitization to an antigen; generally nonspecific.t is in contrast to acquired/adaptive immunity. â¢ Innate Immunity: Immunity that is naturally present and is not due to prior sensitization to an antigen; generally nonspecific.