security meaning and definition

SECURITY noun

Definition of security (noun)

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