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- DictionarySe·cu·ri·ty/səˈkyo͝orədē/
noun
- 1. the state of being free from danger or threat: "the system is designed to provide maximum security against toxic spills"
- 2. a 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.