—n. 1. freedom from danger, risk, etc.; safety.
2. freedom from care, anxiety, or doubt; well-founded confidence.
3. something that secures or makes safe; protection; defense.
4. freedom from financial cares or from want: The insurance policy gave the family security. 5. precautions taken to guard against crime, attack, sabotage, espionage, etc.: The senator claimed security was lax and potential enemies know our plans. 6. a department or organization responsible for protection or safety: He called security when he spotted the intruder. 7. protection or precautions taken against escape; custody: The dangerous criminal was placed under maximum security. 8. an assurance; guarantee.
9. Law. a. something given or deposited as surety for the fulfillment of a promise or an obligation, the payment of a debt, etc.
b. one who becomes surety for another.
10. an evidence of debt or of property, as a bond or a certificate of stock.
11. Usually, securities. stocks and bonds.
12. Archaic.overconfidence; cockiness.
—adj. of, pertaining to, or serving as security: The company has instituted stricter security measures.