active immunity

noun Immunology.
immunity in an organism resulting from its own production of antibody or lymphocytes.


Origin:
1910–15

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

active immunity n.
Immunity resulting from the development of antibodies in response to the presence of an antigen, as from vaccination or exposure to an infectious disease.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
active immunity  
See under acquired immunity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Active immunity is usually long-lasting immunity produced by the immune system in response to antigens.
Active immunity can be acquired in two ways, either by contracting the disease or through vaccination.
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