Juneau Syllabification: (Ju·neau)Pronunciation: /ˈjo͞onō/Definition of Juneau the capital of Alaska, a seaport on an inlet of the Pacific Ocean, in the southern part of the state; population 30,988 (est. 2008). Origin:named after Joseph Juneau, who discovered gold there in 1880Juneau in other Oxford dictionaries Definition of Juneau in the British & World English dictionary