階
Kana: かい
floor (of a building)
Example sentence
私は五階に住んでいます。
わたしはごかいにすんでいます。
I live on the fifth floor.
What 階 means
階 (かい) is a Japanese word meaning “floor (of a building)”. It belongs to the Places & Travel topic and appears at Level 1, so it is one of the words worth learning early when you study Japanese.