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)