Security is protection of a person, building, organization, or country against threats such as crime or attacks by foreign countries : The station was closed for two hours because of a security alert, 30 demonstrators were killed in clashes with the security forces over the weekend, The tighter security measures/precautions include video cameras throughout the city centre, The students were deported because they posed a threat to national security, The banks must tighten security against fraud, The most dangerous criminals are held in maximum-security prisons (= prisons that are as difficult as possible to escape from).

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