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Synonyms for Illumination (same or very similar meaning)

WordNet sense 1 (a condition of spiritual awareness; divine illumination):
light

WordNet sense 2 (an interpretation that removes obstacles to understanding):
clarification, elucidation

WordNet sense 3 (the luminous flux incident on a unit area):
illuminance

WordNet sense 4 (painting or drawing included in a book (especially in illuminated medieval manuscripts)):
miniature


From the ODE community, based on WordNetadd/edit