[im-yuh-nahyz, ih-myoo-nahyz]
verb (used with object), immunized, immunizing.
to make immune.
to render harmless or ineffective; neutralize.
Law. to grant (a witness) immunity.
Also, especially British, immunise.

1890–95; immune + -ize

immunizer, noun
hyperimmunize, verb (used with object), hyperimmunized, hyperimmunizing.
nonimmunized, adjective
overimmunize, verb (used with object), overimmunized, overimmunizing.
unimmunized, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
immunize or immunise (ˈɪmjʊˌnaɪz)
to make immune, esp by inoculation
immunise or immunise
immuni'zation or immunise
immuni'sation or immunise
'immunizer or immunise
'immuniser or immunise

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

immunize im·mu·nize (ĭm'yə-nīz')
v. im·mu·nized, im·mu·niz·ing, im·mu·niz·es

  1. To render immune.

  2. To produce immunity in, as by inoculation.

im'mu·ni·za'tion (-nĭ-zā'shən) n.
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
immunization   (ĭm'yə-nĭ-zā'shən)  Pronunciation Key 
  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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