1. An official document issued by a government identifying a citizen, certifying his or her nationality, and formally requesting admittance and safe passage from foreign countries.
2. An official permit issued by a foreign country allowing one to transport goods or to travel through that country.
3. An official document issued by an allied foreign government to a ship, especially a neutral merchant ship in time of war, authorizing it to enter and travel through certain waters freely.
4. Something that gives one the right or privilege of passage, entry, or acceptance: Hard work was her passport to success.
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