protected from a disease or the like, as by inoculation.
of or pertaining to the production of antibodies or lymphocytes that can react with a specific antigen: immune reaction.
exempt or protected: immune from punishment.
not responsive or susceptible: immune to new ideas.
a person who is immune.

1400–50; late Middle English < Latin immūnis exempt, equivalent to im- im-2 + -mūnis; see common

hyperimmune, adjective
nonimmune, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
immune (ɪˈmjuːn)
adj (foll by to)
1.  protected against a specific disease by inoculation or as the result of innate or acquired resistance
2.  See antibody relating to or conferring immunity: an immune body
3.  unsusceptible (to) or secure (against): immune to inflation
4.  exempt from obligation, penalty, etc
5.  an immune person or animal
[C15: from Latin immūnis exempt from a public service, from im- (not) + mūnus duty]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Medical Dictionary

immune im·mune (ĭ-myoōn')

  1. Of, relating to, or having immunity to infection by a specific pathogen.

  2. Relating to the mechanism of sensitization in which the reactivity is so altered by previous contact with an antigen that the responsive tissues respond quickly upon subsequent contact.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It wasn't that smoking was safe, or that mice were immune.
But its ruling does not necessarily mean that other colleges' policies are now
  immune to legal challenges.
But student-loan debt seems to be immune from this newfound penny-pinching.
It was approved for use along with other medicines that suppress the immune
  system, including corticosteroids.
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