Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Not subject to an obligation imposed on others; exempt: immune from taxation; immune from criminal prosecution.
  • adj. Not affected by a given influence; unresponsive: immune to persuasion.
  • adj. Immunology Of, relating to, or having resistance to infection by a specific pathogen.
  • adj. Immunology Of or relating to sensitized antibodies or lymphocytes that react to specific agents.
  • n. A person who is immune to a particular infection.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Exempt; not subject to
  • adj. Protected by inoculation, or due to innate resistance to pathogens
  • adj. Not vulnerable
  • adj. Of or pertaining to the immune system
  • n. A person who is not susceptible to infection by a particular disease

from the GNU version of the Collaborative International Dictionary of English

  • adj. Exempt; protected.
  • adj. Protected from disease due to the action of the immune system, especially by having been inoculated against or previously exposed to a disease.
  • adj. Of or pertaining to the immune system or the components of the immune system.
  • adj. Not responsive.
  • n. One who is immune; esp., a person who is immune from a disease by reason of previous affection with the disease or inoculation.

from The Century Dictionary and Cyclopedia

  • Exempt; specifically, protected by inoculation: as, an immune animal.
  • n. One who is exempt; specifically, one who is protected from a particular disease by inoculation or by a previous attack.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (usually followed by `to') not affected by a given influence
  • adj. relating to the condition of immunity
  • adj. secure against
  • adj. relating to or conferring immunity (to disease or infection)
  • n. a person who is immune to a particular infection

Etymologies

Middle English, from Latin immūnis; see mei-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin immūnis ("exempt from public service"), from in- ("not") + mūnus ("service") (Wiktionary)

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