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English definition of “security”

security

noun     /sɪˈkjʊərəti/
[U] the protection of people , organizations , countries , etc. against a possible attack or other crime : border / homeland / national securityboost/improve/tighten security Airport security has been tightened since the terrorist threat . lax / strict / tight security He was head of security at the Federal Aviation Administration . security firm / contractor / company security system/check/measure Anyone entering the building has to undergo a series of security checks . The airport was temporarily closed due to a security alert . security cameras / lights / doors
[U] IT, BANKING, INTERNET the protection of information against being stolen or used wrongly or illegally : data / information /IT securitysecurity measures/checks/controls The bank has taken additional security measures to ensure accounts are protected .
[U] the fact or feeling that your job , money , etc. is safe and you will not lose it: He left the relative security of a corporate job to set up on his own.give/offer sb security His 15-year career in investment banking has given him the financial security to transfer his skills to the voluntary sector . economic / financial security They are concerned about the security of their investments .
[C, usually plural] (plural securities) FINANCE, STOCK MARKET a financial investment such as a bond or share that is traded on a financial market : buy/hold/sell securities Investors who bought securities made up of subprime loans suffered the biggest losses . deal in/ invest in/ issue securities a securities agreement / audit / dealer a securities business / company / house
[U] FINANCE property or goods that you promise to give someone if you cannot pay them what you owe them: give/offer/pledge sth as security She signed papers pledging their home as security against the loan .
→ See also asset-backed, bearer security, continuing security, convertible security, dated security, employment security, food security, fixed-interest security, gilts, government security, job security, listed security, long-term security, marketable security, medium-term security, mortgage-backed, negotiable, short-term security, undated security, unlisted security
(Definition of security noun from the Cambridge Business English Dictionary © Cambridge University Press)
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