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English definition of “security”

security

noun [U] (MONEY)   /sɪˈkjʊər·ɪ·t̬i/
money you pay someone that can be legally used by that person if your actions cause the person to lose money , but that will be returned to you if it is not used: You have give the landlord an extra month’s rent as security when you sign the lease .
(Definition of security noun (MONEY) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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