Noun

1. The light-deprived, hence not or badly visible portion of an object (or creature), either temporarily or permanently.

   Before I take the next picture, turn so the camera gets less of your dark side.

2. An unseen, invisible or unknown portion, especially in reference to the side of a celestial body not facing its sun
3. A distinctly negative ethical paradigm; any evil aspect.

   Star Wars archvillain Darth Vader is actually the incarnated dark side of a hero.

Quotations

• 1972, Warren Grant Magnuson, Jean Carper, The Dark Side of the Marketplace: The Plight of the American Consumer (Italics added for emphasis) ISBN 0131971867