一階 いっかい first floor #2,855 Meanings also 1階 noun first floor; ground floor one floor; one storey one rank Its kanji 一 イチ、イツ · ひと-、ひと.つ one, one radical (no.1) 階 カイ · きざはし storey, stair, counter for storeys of a building In sentences Furigana 彼かれは私わたしより一階いっかい級きゅう上うえだ。 He is immediately above me in rank. #105639 あのビルの一階いっかいにあります。 It's on the first floor of that building. #231269