national security meaning

• [Defence]
  A collective term encompassing both national defense and foreign relations of the United States.
  Specifically, the condition provided by: a.
  a military or defense advantage over any foreign nation or group of nations; b.
  a favorable foreign relations position; or c.
  a defense posture capable of successfully resisting hostile or destructive action from within or without, overt or covert.
  See also security.
• 
  [Medicine]
  Regulations to assure protection of property and equipment.

• national security agency:    Noun: National Sec ...
• national security council:    Noun: National Sec ...
• national security interests:    [Defence] The foun ...

Examples

1. the u.s. president is the chairman of the national security council.
2. on thursday the national security council held a long and confused session.
3. in november 1975 president ford took away my job as national security adviser.
4. its role was to review the options to be presented to the national security council.
5. the national security adviser has always had to make do with humble and compact quarters.