from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Code letters used at the beginning of radio messages intended for all receivers.
  • abbr. call to quarters

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. General call; Calling all stations.
  • Central Queensland
  • Knight of the National Order of Quebec


Origin unknown.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French sécurité. It is often (incorrectly) believed to come from English seek you. (Wiktionary)


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