Age of Reason

  1. a period of European history in the 18th cent. noted for belief in the ability of reason to discover truth, shape society, etc.
  2. the age at which a child is presumed to know right from wrong and be capable of responsible action

See Age of Reason in American Heritage Dictionary 4

noun
  1. An era in which rationalism prevails, especially the period of the Enlightenment in England, France, and the United States.
  2. An age at which a person is considered capable of making reasoned judgments.
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