- Each of a series of five progressive levels of alert used by the US armed forces: conventional and nuclear forces were moved to DEFCON 2 • figurative my stress levels have finally reached defcon 1More example sentences
- Tolerance level for people in general is at DEFCON 1.
- I'm at DEFCON - 3 with the washing machine actually.
- The Defense Department has these procedures - the "Defense Condition," or DEFCON, system.
1950s: acronym from defense readiness condition.