► 名詞
階 [(1)かい] meaning: floor rank: 2
☆ 彼の部屋は上の階だ ⇨ His room is on the floor above (☛ The concept of 階 is actually a level or strata, not a floor, so 一階 is the ground floor, 二階 is 1st floor in the European convention)
☆ 私の部屋は十階にある ⇨ My room is on 10th floor (☛ The concept of 階 is actually a level or strata, not a floor, so 一階 is the ground floor, 二階 is 1st floor in the European convention)