from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics The
speedof electromagnetic radiationin a perfect vacuum: exactly 299,792,458 metresper second by definition.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second
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