1. the state of being watchful and alert, especially to avoid danger or problems

Examples

• The security guard maintained constant vigilance throughout the night.
• Parents must exercise vigilance when their children are playing near water.
• The doctor’s vigilance helped detect the early signs of the disease.
• Eternal vigilance is the price of liberty.
• The neighborhood watch program increased vigilance against crime.
• Her vigilance paid off when she spotted the error in the contract.
• Airport security requires extreme vigilance to prevent dangerous items from passing through.