DEFCON

noun
DEF·​CON | \ ˈdef-ˌkän How to pronounce DEFCON (audio) \

Definition of DEFCON

: 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

First Known Use of DEFCON

1959, in the meaning defined above

History and Etymology for DEFCON

defense condition

Learn More About DEFCON

Dictionary Entries Near DEFCON

defaunate

DEFCON

defeasance

See More Nearby Entries 

Statistics for DEFCON

Cite this Entry

“DEFCON.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/DEFCON. Accessed 12 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!