noun, plural immunities.
the state of being immune from or insusceptible to a particular disease or the like.
the condition that permits either natural or acquired resistance to disease.
the ability of a cell to react immunologically in the presence of an antigen.
exemption from any natural or usual liability.
exemption from obligation, service, duty, or liability to taxation, jurisdiction, etc.: The ambassador claimed diplomatic immunity when they arrested him for reckless driving.
Law. exemption from criminal prosecution or legal liability or punishment on certain conditions.
special privilege.
the exemption of ecclesiastical persons and things from secular or civil liabilities, duties, and burdens.
a particular exemption of this kind.

1350–1400; Middle English immunite < Latin immūnitās. See immune, -ity

hyperimmunity, noun
nonimmunity, noun, plural nonimmunities.
self-immunity, noun, plural self-immunities.

immunity, impunity.

4. See exemption. 5. franchise, license, liberty, prerogative.

1. susceptibility. 4, 5. liability. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
immunity (ɪˈmjuːnɪtɪ)
n , pl -ties
1.  acquired immunity See also natural immunity the ability of an organism to resist disease, either through the activities of specialized blood cells or antibodies produced by them in response to natural exposure or inoculation (active immunity) or by the injection of antiserum or the transfer of antibodies from a mother to her baby via the placenta or breast milk (passive immunity)
2.  freedom from obligation or duty, esp exemption from tax, duty, legal liability, etc
3.  any special privilege granting immunity
4.  the exemption of ecclesiastical persons or property from various civil obligations or liabilities

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1382, "exempt from service or obligation," from L. immunitatem (nom. immunitas) "exemption from performing public service or charge," from immunis "exempt, free," from in- "not" + munis "performing services" (cf. municipal), from PIE *moi-n-es-, suffixed form of base
*mei- "to change" (see mutable). Medical sense "protection from disease" is 1879 from Fr. or Ger.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

immunity im·mu·ni·ty (ĭ-myōō'nĭ-tē)

  1. The quality or condition of being immune.

  2. Inherited, acquired, or induced resistance to infection by a specific pathogen.

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
immunity   (ĭ-my'nĭ-tē)  Pronunciation Key 
The protection of the body from a disease caused by an infectious agent, such as a bacterium or virus. Immunity may be natural (that is, inherited) or acquired. See also acquired immunity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

immunity definition

The ability of the body to resist or fight off infection and disease.

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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Example sentences
He was a founder of immunochemistry, the study of the chemical reactions and
  phenomena of immunity.
They also argued that such immunity is intended to shield individual officials,
  and not governing boards, from liability.
And it is this that seems to explain their immunity.
Vaccines depend on them, and scientists are even employing the cells to stir up
  immunity against cancer.
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