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[im-yuh-nuh-zey-shuh n, ih-myoo-] /ˌɪm yə nəˈzeɪ ʃən, ɪˌmyu-/
the fact or process of becoming immune, as against a disease.
Finance. a method of protection against fluctuating bond interest rates by investing in securities having different yields and terms.
1890-95; immunize + -ation
Related forms
hyperimmunization, noun
nonimmunization, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for immunizations
  • But many diseases targeted by immunizations sure could.
  • Although some immunizations are required upon visiting certain locations, there are others that may only be recommended.
  • They also support health officials' decision to target high-risk populations for the first immunizations.
  • The clinical content of preconception care: immunizations as part of preconception care.
  • immunizations have almost completely eliminated these infections in developed countries.
  • Children may have a low-grade fever for one or two days after some immunizations.
  • Make sure your pets receive the proper immunizations.
  • The clue was ambiguous, however, since some allied troops had also had immunizations.
  • Many serious diseases can be prevented by immunizations.
  • immunizations are preventive measures taken to protect people from diseases throughout their lives.
Word Origin and History for immunizations



1893, from immunize + -ation.

Online Etymology Dictionary, © 2010 Douglas Harper
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immunizations in Science
  1. The process of inducing immunity to an infectious organism or agent in an individual or animal through vaccination.

  2. A vaccination that induces immunity. A recommended schedule of immunizations for infants and young children includes vaccines against diphtheria, polio, tetanus, measles, mumps, and rubella.

immunize verb
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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immunizations in Culture

immunization definition

The process of inducing immunity, usually through inoculation or vaccination.

Note: Frequently, schoolchildren are required by state law to be immunized against certain diseases. Because of such widespread immunization, many diseases that used to be fairly common, including smallpox, tetanus, and whooping cough, have become rare.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Article for immunizations


process by which resistance to disease is acquired or induced in plants and animals. This discussion focuses on immunization against infectious diseases in vertebrate animals, specifically humans.

Learn more about immunization with a free trial on
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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