enlightenment

Short definition from Wiktionary

Noun

1. 1
   An act of enlightening, or the state of being enlightened or instructed.
2. 2
   A concept in spirituality, philosophy and psychology related to achieving clarity of perception, reason and knowledge.

Proper noun

1. 1
   A 17th- and 18th-century European intellectual movement emphasizing rationalism. The period during which it flourished is called the Age of Enlightenment or Age of Reason.