ENLIGHTENMENT meaning : 1 : the state of having knowledge or understanding the act of giving someone knowledge or understanding; 2 : a movement of the 18th century that stressed the belief that science and logic give people more knowledge and understanding than tradition and religion The Enlightenment was the period in the 18th century in Europe when particular thinkers began to emphasize the importance of science and reason rather than religion and tradition. The Enlightenment (Age of Reason) was a revolution in thought in Europe and North America from the late 17th century to the late 18th century. The Enlightenment involved new approaches in philosophy... Learn the four meanings of the noun enlightenment in English, from education to philosophy, and its origin and usage. Find out how common and how to pronounce enlightenment in British and American English.