かい
kai

Noun
Suffix

1. storey; story; floor

それはもうひとしたきざはしですよ。
sorewa mō hitotsukano kaidesuyo
That's one level down.
Noun

2. stairs

わたくし部屋へやよんかいにあります。
watashino heyawa yonkaini arimasu
My apartment is on the fourth floor.
Noun
Suffix

3. stage (in chronostratigraphy)

Counter

4. counter for storeys and floors of a building