Dictionary.com
definitions

port of entry

noun

port1(def 3).

Origin of port of entry

First recorded in 1830–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for port of entry

port of entry

noun

law an airport, harbour, etc, where customs officials are stationed to supervise the entry into and exit from a country of persons and merchandise
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012