›[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 securityHe was head of security at the Federal Aviation Administration.security firm/contractor/companysecurity system/check/measureAnyone 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, INTERNETthe protection of information against being stolen or used wrongly or illegally: data/information/IT securitysecurity measures/checks/controlsThe 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 securityHis 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](pluralsecurities)FINANCE, STOCK MARKETa financial investment such as a bond or share that is traded on a financial market: buy/hold/sell securitiesInvestors who bought securities made up of subprime loans suffered the biggest losses.deal in/invest in/issue securitiesa securities agreement/audit/dealera securities business/company/house
›[U]FINANCEproperty or goods that you promise to give someone if you cannot pay them what you owe them: give/offer/pledge sth as securityShe signed papers pledging their home as security against the loan.