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.

(politics, euphemistic) An army.

(cryptography) Not decodable with all available computer power.

A branch of information security applied to both theoretical and actual computer systems and networks.

A person who is employed to provide security for people or property.

(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.

A region of the world in which large-scale use of violence, such as war, among nations is highly unlikely.

(software engineering, of software) designed from the ground up to be secure

(military) To guard the firearms from becoming wet.

(US) The concerted national effort, principally by government, to keep the United States safe and resilient to terrorism and other hazards.