The crossword solution for the term INTERNATIONAL ___ LINE is DATE, which is a four letter word. The term INTERNATIONAL DATE LINE is an imaginary LINE on the surface of the Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next. It passes through the middle of the Pacific Ocean and roughly follows 180° longitude, although it deviates to pass around some territories and island groups. It is used to determine the DATE in different time zones.