二階 にかい Also written 2階 Meanings Noun second floor; upstairs Kanji 二 two. Read as ニ. 階 floor. Read as カイ. Common phrases 二階にある 二階に上がる 二階にいる 二階に住む Words containing 二階 二階建て (にかいだて) two-storied building 冠位十二階 (かんいじゅうにかい) first system to rank officials into 12 levels (603 CE) 中二階 (ちゅうにかい) mezzanine floor And 8 more. Jinuma: Japanese Dictionary · Word lists