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speed of light (the speed of electromagnetic radiation in a vacuum or in a substance)
The speed of light is approximately 299,792,458 meters per second.
plural of vitesse de la lumière
The speeds of light vary in a vacuum and in the air.
plural of lumière
The lights were sparkling in the night.
(history) Age of Enlightenment
The 18th century is often called the Age of Enlightenment.
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