Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Alternative form of lightspeed.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. 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

Etymologies

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