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People beginning in the mid 20th century have used the term Counter-Enlightenment to describe strains of thought that arose in the late 18th and early 19th centuries in opposition to the 18th-century Enlightenment.

Although the first known use of the term in English occurred in 1949 and there were several earlier uses of it, including one by German philosopher Friedrich Nietzsche, the term "Counter-Enlightenment" is usually associated with Isaiah Berlin, who is often credited for re-inventing it. Discussion of this concept began with Isaiah Berlin's 1973 Essay, The Counter-Enlightenment. He published widely about the Enlightenment and its challengers and did much to popularise the concept of a Counter-Enlightenment movement that he characterized as relativist, anti-rationalist, vitalist, and organic, which he associated most closely with German Romanticism.

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