Definition of security

• n. - The condition or quality of being secure; secureness.
• n. - Freedom from apprehension, anxiety, or care; confidence of power of safety; hence, assurance; certainty.
• n. - Hence, carelessness; negligence; heedlessness.
• n. - Freedom from risk; safety.
• n. - That which secures or makes safe; protection; guard; defense.
• n. - Something given, deposited, or pledged, to make certain the fulfillment of an obligation, the performance of a contract, the payment of a debt, or the like; surety; pledge.
• n. - One who becomes surety for another, or engages himself for the performance of another's obligation.
• n. - An evidence of debt or of property, as a bond, a certificate of stock, etc.; as, government securities.