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Definition of National security

National security Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
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.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
National security Definition from Social Science Dictionaries & Glossaries
National Standards for Civics and Government
Condition of a nation's safety from threats, especially threats from external sources.
National security Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
National security is the requirement to maintain the survival of the state through the use of economic power, diplomacy, power projection and political power. The concept developed mostly in the United States after World War II. Initially focusing on military might, it now encompasses a broad range of facets, all of which impinge on the non military or economic security of the nation and the values espoused by the national society. Accordingly, in order to possess national security, a nation needs to possess economic security, energy security, environmental security, etc. Security threats involve not only conventional foes such as other nation-states but also non-state actors such as violent non-state actors, narcotic cartels, multinational corporations and non-governmental organisations; some authorities include natural disasters and events causing severe environmental damage in this category.

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