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noun (plural securities)
1the state of being free from danger or threat:the system is designed to provide maximum security against toxic spills job security the safety of a state or organization against criminal activity such as terrorism, theft, or espionage:a matter of national security procedures followed or measures taken to ensure the safety of a state or organization:amid tight security the presidents met in the Colombian resort the state of feeling safe, stable, and free from fear or anxiety:this man could give the emotional security she needed 2a private police force that guards a building, campus, park, etc.. 3a thing deposited or pledged as a guarantee of the fulfillment 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.