单词	DEFCON
释义	DEFCON noun DEF·​CON ˈdef-ˌkän  : any one of five levels of U.S. military defense readiness that are ranked from 5 to 1 according to the perceived threat to national security, with 1 indicating the highest level of perceived threat It was determined that the secretary of Defense had the authority to declare DEFCON 3 on his authority. Stephen A. Cambone —sometimes used figuratively Don't even mention the privatization of Social Security that will take Congress to DEFCON 1. Sam Allis Word History Etymology defense condition First Known Use 1959, in the meaning defined above
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