an official document issued by the government of a country to one of its citizens and, varying from country to country, authorizing travel to foreign countries and authenticating the bearer's identity, citizenship, right to protection while abroad, and right to reenter his or her native country.
2.
anything that ensures admission or acceptance: A good education can be your passport to success.
3.
any authorization to pass or go somewhere.
4.
a document issued to a ship, esp. to a neutral merchant ship in time of war, granting or requesting permission to proceed without molestation in certain waters.
5.
a certificate intended to secure admission.
Origin: 1490–1500; earlier passeport < MF, equiv. to passe- (s. of passer to pass) + portport1
An official government document that certifies one's identity and citizenship and permits a citizen to travel abroad.
An official permit issued by a foreign country allowing one to transport goods or to travel through that country.
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.
Something that gives one the right or privilege of passage, entry, or acceptance: Hard work was her passport to success.
[French passeport, from Old French : passer, to pass; see pass + port, port; see port1.]
[pas-pawrt, -pohrt, pahs-] 
pɔrt