Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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Department of Homeland Security an executive department of the U.S. federal government whose mission is to protect U.S. citizens and property from terrorist assault.
security blanket a blanket, toy, or the like carried by a child for a feeling of comfort and security. [2 definitions]
Security Council the council of the United Nations that is responsible for maintaining international peace and comprises five permanent and ten temporary members.
social security (often cap.) in the United States, an assistance plan for the elderly, unemployed, or disabled funded by mandatory contributions from employers, employees, and the government. [3 definitions]
Social Security Number a number issued by the U.S. federal government to citizens, permanent residents, and temporary working residents of the United States for the purposes of tracking working individuals.