Breakdown of kaidan
grade
段
story of a building
階
A wall surrounds all stories of a building. That's why the roof isn't considered a story.
Usages of kaidan
階段 を 登る。kaidan wo noboru.
I go up the stairs.
階段 の 下 に 荷物 が ある。kaidan no sita ni nimotu ga aru.
There is luggage under the stairs.
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