1. Plural of navicert; official certificates issued by a government to neutral ships certifying that cargo is not contraband and may proceed safely during wartime.
Usage: historical; chiefly British; used especially during World War I

Examples

• During World War I, neutral merchant ships required navicerts to avoid being stopped and searched by British naval patrols.
• The navicerts system was designed to allow legitimate trade while preventing supplies from reaching enemy nations.
• Captains carried navicerts as proof that their cargo had been inspected and approved by authorities.
• The issuance of navicerts became a tool of economic warfare during the Great War.