Definition of "illumination" []

• The act of illuminating. (noun)
• The state of being illuminated. (noun)
• A source of light. (noun)
• Decorative lighting. (noun)
• Spiritual or intellectual enlightenment. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "[15] It should be borne in mind that the author uses the term illumination in the sense of color applied within a distinct and limiting outline."
• "This can be done for each part of the spectrum, and so a complete curve can be constructed, which we call the illumination curve of the spectrum of the light under consideration."
• "In which case, I still think twilight is the way to go - full dark minimises her own chances of success, as even faint illumination from the ground will silhouette her landing zone and reduce accuracy."