The first place where one stops to visit, accomplish something, or begin a process. Taken from nautical terminology, referring to the first port that a seafaring vessel calls in to at the beginning of a voyage. The president's first port of call on his re-election campaign will be his hometown. If your passport is lost while traveling abroad, your first port of call should be your home country's consulate or embassy. Paris will be our first port of call on our trip through Europe.