■ noun ( plural securities )
1》 the state of being or feeling secure.
2》 the safety of a state or organization against criminal activity such as terrorism.
↘measures taken to ensure such safety.
3》 a thing deposited or pledged as a guarantee of the fulfilment of an undertaking or the repayment of a loan, to be forfeited in case of default.
4》 a certificate attesting credit, the ownership of stocks or bonds, or the right to ownership connected with tradable derivatives.