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Enlightenment

The Enlightenment, also called the Age of Reason, was an intellectual and cultural movement of the 17th and 18th centuries that emphasized reason, scientific inquiry, and criticism of tradition and authority.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 27, 2026|2 min read| Fact-checked

The Enlightenment, also called the Age of Reason, was an intellectual and cultural movement of the 17th and 18th centuries that emphasized reason, scientific inquiry, and criticism of tradition and authority. It shaped modern ideas about liberty, tolerance, constitutional government, and human rights, and influenced major political revolutions in Europe and North America.

Origins and timeline

Historians usually place the Enlightenment in the 18th century, with intellectual roots in earlier scientific and philosophical developments. Common boundary dates are 1688 and 1789, corresponding roughly to the Glorious Revolution and the French Revolution.

Core ideas

Enlightenment thought emphasized reason, evidence, and critical inquiry as the best guides to knowledge and reform. It also promoted progress, liberty, tolerance, and the idea that laws and institutions should be judged rationally.

Political and social impact

Enlightenment ideas helped challenge absolutism, religious persecution, and inherited privilege. They influenced revolutionary and constitutional movements in Europe and North America, including the American and French Revolutions.

Philosophical significance

In philosophy, the Enlightenment shifted attention toward how knowledge is formed, especially through empiricism and the limits of human understanding. Kant’s definition of enlightenment as humanity’s emergence from self-imposed immaturity became especially influential.

Key facts

  • Enlightenment thinkers placed reason above superstition and blind faith.
  • The movement promoted scientific inquiry, empirical evidence, and progress.
  • It supported ideals such as liberty, tolerance, and equality before the law.
  • Enlightenment ideas influenced constitutional government and the separation of church and state.
  • Its influence extended into the American Declaration of Independence and the Declaration of the Rights of Man and Citizen.
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Canadian context

Enlightenment ideas influenced constitutionalism, individual rights, and political thought that later shaped Canada’s legal and civic traditions through British and French intellectual currents.

Frequently asked questions

What is the Enlightenment?
The Enlightenment was a European intellectual movement that emphasized reason, science, and criticism of tradition and authority.
When did the Enlightenment take place?
It is usually dated to the 18th century, with roots in the late 17th century and a common end point around 1789.
What ideas did Enlightenment thinkers support?
They supported reason, progress, liberty, tolerance, natural rights, and constitutional government.
Who were major Enlightenment figures?
Commonly cited figures include John Locke, Voltaire, Montesquieu, Rousseau, and Immanuel Kant.
How did the Enlightenment affect politics?
It challenged absolute monarchy and religious authority and influenced modern ideas of rights, representative government, and the rule of law.

References

  1. Britannicahttps://www.britannica.com/event/Enlightenment-European-history
    Supports: Definition of the Enlightenment, central ideas of reason, and its broad historical significance.
  2. Britannicahttps://www.britannica.com/topic/Western-philosophy/The-Enlightenment
    Supports: Enlightenment philosophy, empiricism, reason, and key themes such as tolerance and freedom.
  3. Lumen Learninghttps://courses.lumenlearning.com/suny-fmcc-philosophy1/chapter/enlightenment-philosophy-and-thought/
    Supports: Timeline, central concerns, and historical framing of the Enlightenment.
  4. Historyhttps://www.history.com/articles/enlightenment
    Supports: Major figures, roots in the Scientific Revolution, and the Encyclopédie.
  5. Philosophy Institutehttps://philosophy.institute/western-philosophy/enlightenment-philosophy-quest-knowledge-freedom-progress/
    Supports: Enlightenment as Age of Reason, liberty, tolerance, constitutional government, and separation of church and state.
  6. Wikipediahttps://en.wikipedia.org/wiki/Enlightenment_philosophy
    Supports: Influence on revolutionary movements, social values, and political ideals; used cautiously as a supplementary source.