from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Excessive, irrational zeal, especially in politics or religion.

from The Century Dictionary.

  • noun The character or conduct of a fanatic; inordinate zeal or bigotry; the entertainment of wild and extravagant notions, especially in regard to religion.
  • noun Synonyms Credulity, Bigotry, etc. See superstition.

from the GNU version of the Collaborative International Dictionary of English.

  • noun Excessive enthusiasm, unreasoning zeal, or wild and extravagant notions, on any subject, especially religion, politics or ideology; religious frenzy.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The characteristic or practice of being a fanatic.

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

  • noun excessive intolerance of opposing views


from Wiktionary, Creative Commons Attribution/Share-Alike License

fanatic +‎ -ism


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