security

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Concise Oxford English Dictionary © 2008 Oxford University Press:
security/sɪˈkjʊərəti/
noun (pl. 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.
'security' also found in these Oxford entries:

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