What is the meaning of illumination?

noun

• A condition of spiritual awareness; divine illumination.
  • usage: "follow God's light"
  • synonyms: light
• The degree of visibility of your environment.
• An interpretation that removes obstacles to understanding.
  • usage: "the professor's clarification helped her to understand the textbook"
  • synonyms: clarification, elucidation
• The luminous flux incident on a unit area.
  • synonyms: illuminance
• Painting or drawing included in a book (especially in illuminated medieval manuscripts. ).
  • synonyms: miniature