(securities industry) The lending of securities by one brokerage to another, typically for a secondary purpose such as to cover a stock short position. Not to be confused with collateral-type stock loans.

plural of convertible security

plural of restricted security

plural of mortgage-backed security

The UN Security Council.

A blanket that one uses to have a secure feeling or reduced anxiety, usually in the early years of life. / Any object one uses to have a sense of security or reduced anxiety.

(US, informal) A mother for whom issues of safety and national security are of great importance.

(cryptography) Not decodable with all available computer power.

(politics, euphemistic) An army.

A system whereby the state either through general or specific taxation provides various benefits to help ensure the wellbeing of its citizens. / Those benefits paid under such a system.