Vocabulary What does 六日 (むいか, muika) mean? 六日 (むいか, muika) means the 6th day of the month; six days. Quick factsReadingむいかRomajimuikaLevel (estimated, JLPT framework)N5 六日むいかN5 · estimated, JLPT frameworkmuikathe 6th day of the month; six daysGenkiGenki 13Example sentences休(やす)みは六日間(むいかかん)です。The vacation is six days long.六日(むいか)に日本(にほん)へ行(い)きます。I'm going to Japan on the 6th.Kanji in this word六six; the number 6日day; sun