Noun:
1: security the state of being free from danger or injury; "we support the armed services in the name of national security"
2: certificate, security 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"
3: security department, security a department responsible for the security of the institution's property and workers; "the head of security was a former policeman"
4: security, security measures measures taken as a precaution against theft or espionage or sabotage etc.; "military security has been stepped up since the recent uprising"
5: security, protection 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"
6: security freedom from anxiety or fear; "the watch dog gave her a feeling of security"
7: security measure, security, security system an electrical device that sets off an alarm when someone tries to break in
8: surety, security property that your creditor can claim in case you default on your obligation; "bankers are reluctant to lend without good security"
9: security, surety a guarantee that an obligation will be met