1. the state of being safe from danger, harm, or loss
2. measures taken to protect against crime, attack, or other threats
3. the state of feeling safe, stable, and free from fear or anxiety

Examples

• The company hired additional security guards for the event.
• National security is a top priority for the government.
• She felt a sense of security knowing her family was safe.
• The bank requires security before approving the loan.
• He invested in government securities for steady returns.
• Airport security has been increased following recent threats.
• Job security is important for long-term financial planning.
• The security system detected an intruder in the building.