Vocabulary What does 1月 (いちがつ, ichigatsu) mean? 1月 (いちがつ, ichigatsu) means January. Quick factsReadingいちがつRomajiichigatsuPart of speechnoun 1月いちがつichigatsuJanuary1noun January2noun first month of the lunar calendarAlso written: 一月Kanji in this word月month; moon