security
noun
1.
2.
3.
4.
a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends
5.
property that your creditor can claim in case you default on your obligation
6.
a department responsible for the security of the institution's property and workers
8.
an electrical device that sets off an alarm when someone tries to break in
9.
measures taken as a precaution against theft or espionage or sabotage etc.