What does SECURITY mean?

noun

1. the state of being free from danger or injury“we support the armed services in the name of national security”
2. defense against financial failure; financial independence“his pension gave him security in his old age”
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”
5. property that your creditor can claim in case you default on your obligation“bankers are reluctant to lend without good security”
6. a department responsible for the security of the institution's property and workers“the head of security was a former policeman”
7. a guarantee that an obligation will be met
8. an electrical device that sets off an alarm when someone tries to break in