30 さんじゅう Also written 卅, みそ, 三十, 三〇, 参拾, 丗 Meanings Number thirty; 30 6am (as 30時, 30:00, etc.) Words containing 30 30日 (さんじゅうにち) 30th day of the month 30年代 (さんじゅうねんだい) the '30s 30代 (さんじゅうだい) (one's) 30s And 2 more. Jinuma: Japanese Dictionary · Word lists