Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

security

noun (PROTECTION)
 
 
/sɪˈkjʊə.rɪ.ti/ US  /-ˈkjʊr.ə.t̬i/

Definition

B1 [U] 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 in the city centre. The students were deported because they posed a threat to national security. The proposed national identity card system would help to tighten security against fraud. The most dangerous criminals are held in maximum-security prisons (= prisons that are as difficult as possible to escape from).Protection and protectorsEnvironmental issues [U, + sing/pl verb] the group of people responsible for protecting a building: You'll need to notify security if you want to work late in the office.Protection and protectorsEnvironmental issues
(Definition of security noun (PROTECTION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“security” in other dictionaries

Word of the Day

honest-to-goodness

real or true

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More