Vocabulary What does 十五 (じゅうご, juugo) mean? 十五 (じゅうご, juugo) means fifteen; 15. Quick factsReadingじゅうごRomajijuugoPart of speechnumeric 十五じゅうごjuugofifteen; 151numeric fifteen; 15Also written: 15、一五Kanji in this word十ten; the number 10五five; the number 5