Miami1 Syllabification: (Mi·am·i)Pronunciation: /mīˈamē/Definition of Miami a city and port in southeastern Florida; population 413,201 (est. 2008). Its subtropical climate and miles of beaches make this and the resort island of Miami Beach, separated from the mainland by Biscayne Bay, a year-round holiday resort. Miami in other Oxford dictionaries Definition of Miami in the British & World English dictionary