National security, especially with regard to the threat of terrorism within a country's borders.
 Department of Homeland Security
 Example sentencesExamples
-  The increase in expenditures on domestic homeland security over the decade exceeds $1 trillion.
 -  The government sector continues to buy systems to improve homeland security.
 -  The acquisition deepens the risk-management brand in areas of fraud, ID theft, and homeland security.
 -  This advantage is particularly timely, given the current issues with homeland security.
 -  The future of homeland security will depend upon the preparedness initiatives at the local level.
 -  The Gunpowder Plot of 1605 fixated the country on homeland security.
 -  A very funny scene shows retirees patrolling the waters of Florida in an effort to provide some geriatric form of homeland security.
 -  He could not believe that his party would hold up homeland security to please an interest group.
 -  I won't take space debating the need to review student backgrounds in the interest of homeland security.
 -  The company is considering a whole new market: homeland security.