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.
anything that ensures admission or acceptance:
A good education can be your passport to success.
any authorization to pass or go somewhere.
a document issued to a ship, especially to a neutral merchant ship in time of war, granting or requesting permission to proceed without molestation in certain waters.
a certificate intended to secure admission.
Origin of passport
1490-1500; earlier passeport < Middle French, equivalent to passe- (stem of passer to pass) + portport1
c.1500, from Middle French passeport "authorization to pass through a port" to enter or leave a country (15c.), from passe, imperative of Old French passer "to pass" (see pass (v.)) + port "port" (see port (n.1)).