Vocabulary What does 一ヶ月 (いっかげつ, ikkagetsu) mean? 一ヶ月 (いっかげつ, ikkagetsu) means one month. Quick factsReadingいっかげつRomajiikkagetsuPart of speechnoun 一ヶ月いっかげつikkagetsuone month1noun one monthAlso written: 一ヵ月、一カ月、一か月Kanji in this word一one; the number 1月month; moon