A document or escort providing safe passage through a region especially in time of war WordNet 3.0 & Open English WordNet

Safe conduct, safe passage, or letters of transit, is the situation in time of international conflict or war where one state, a party to such conflict, issues to a person a pass or document to allow the enemy alien to traverse its territory without harassment, bodily harm, or fear of death. Wikipedia

situation in time of international conflict or war where one state, a party to such conflict, issues to a person, a pass or document to allow the enemy alien to traverse its territory Wikidata

Permit issued by an authority which guarantees a person to enter and spend time in a place in which otherwise she could not enter. OmegaWiki

A document that grants safe passage through enemy territory in times of war. Wiktionary

Document. Wiktionary (translation)

A safe-conduct or passport, especially in time of war. Wiktionary

A safe-conduct, especially in time of war. Wiktionary (translation)