security

noun:the state of being free from danger or threat
- The new alarm system provides a greater sense of security for the residents.
noun:an asset pledged to secure repayment of a loan or performance of an obligation; subject to forfeiture if the borrower defaults
- He used his house as security for the business loan.
noun:a financial instrument, such as a stock or bond, representing an investment
- The company issued new securities to raise capital for expansion.
noun:the department or personnel responsible for protecting a building, area, or people
- Security escorted the disruptive individual from the premises.