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Definition of the Age of Enlightenment from the Oxford Advanced Learner's Dictionary

 

the Age of Enlightenment

 
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(also the Age of Reason)
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a period in Europe in the 18th century when many writers and thinkers began to question established beliefs, e.g. in the authority of kings or of the Church, in favour of reason and scientific proof. The idea developed that everyone was of equal value and had equal rights.