Usually means: Distance light travels in one second.
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We found 9 dictionaries that define the word light second:

General (8 matching dictionaries)
  1. light second: Vocabulary.com
  2. light second: Wiktionary
  3. light second: Dictionary.com
  4. Light-second: Wikipedia, the Free Encyclopedia
  5. light second: Rhymezone
  6. light second: FreeDictionary.org
  7. light second: Mnemonic Dictionary
  8. light second: TheFreeDictionary.com

Science (1 matching dictionary)
  1. How Many? A Dictionary of Units of Measurement (No longer online)

(Note: See light_seconds as well.)

Definitions from Wiktionary (light second)

noun:  (astronomy, physics) A unit of length equal to the distance light travels in one second: about 300 megameters

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