Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun General call; Calling all stations.
  • initialism Australia Central Queensland
  • initialism Canada Knight of the National Order of Quebec

Etymologies

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

[Origin unknown.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French sécurité. It is often (incorrectly) believed to come from English seek you.

Examples

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