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- Dictionarynational security
noun
- 1. the safety of a nation against threats such as terrorism, war, or espionage: "an imminent threat to national security"
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noun
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Defense and maintenance of a state through use of all powers at the state's disposal
National security, or national defence (national defense in American English), is the security and defence of a sovereign state, including its citizens, economy, and institutions, which is regarded as a duty of government. Wikipedia