Extreme or uncritical enthusiasm for a particular idea, cause, or belief system that prevents a person from seeing other viewpoints.
Formed from 'fanatic' plus the suffix '-ism' (a doctrine or practice). This is a standard English nominalization creating an abstract noun referring to the behavior or state of being fanatic.
Fanaticism has sparked some of history's most intense conflicts—wars, witch hunts, and revolutions—yet the very same passion, when directed toward science or art, has produced humanity's greatest achievements. It's all about direction.
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