What is the meaning of security?

noun

• The state of being free from danger or injury.
  • usage: "we support the armed services in the name of national security"
• Defense against financial failure; financial independence.
  • usage: "his pension gave him security in his old age"; "insurance provided protection against loss of wages due to illness"
  • synonyms: protection
• Freedom from anxiety or fear.
  • usage: "the watch dog gave her a feeling of security"
• A formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends.
  • usage: "he held several valuable securities"
  • synonyms: certificate
• Property that your creditor can claim in case you default on your obligation.
  • usage: "bankers are reluctant to lend without good security"
  • synonyms: surety
• A department responsible for the security of the institution's property and workers.
  • usage: "the head of security was a former policeman"
  • synonyms: security department
• A guarantee that an obligation will be met.
  • synonyms: surety
• An electrical device that sets off an alarm when someone tries to break in.
  • synonyms: security system, security measure
• Measures taken as a precaution against theft or espionage or sabotage etc..
  • usage: "military security has been stepped up since the recent uprising"
  • synonyms: security measures