freedom from danger, fear, anxiety, destitution, etc

stability or dependability, e.g. in employment

protection

measures taken to protect against esp espionage, theft, sabotage, unauthorized use, etc

(treated as sing. or pl) an organization or department whose task is to maintain security

something pledged to guarantee the fulfilment of an obligation

a person who undertakes to fulfil another person's obligation if that person cannot or does not

an evidence of debt or of ownership, e.g. a stock certificate

the asset represented by such a certificate