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Freedom from risk or danger; safety.
(noun)
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Freedom from doubt, anxiety, or fear; confidence.
(noun)
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Something that gives or assures safety, as:
(noun)
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A group or department of private guards: Call building security if a visitor acts suspicious.
(noun)
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Measures adopted by a government to prevent espionage, sabotage, or attack.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.