a. Not subject to an obligation imposed on others; exempt: immune from being eliminated in a contest.
b. Having legal immunity: immune from taxation.
2. Not affected by a given influence; unresponsive: immune to persuasion.
a. Of or relating to immunity or an immune response.
b. Having resistance to a specific pathogen.
c. Having or producing sensitized antibodies or lymphocytes that react to specific antigens: immune serum.
[Middle English, from Latin immūnis; see mei-1 in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.