层

1. storey, story, floor

noun (common) (futsuumeishi) noun, used as a suffix

阶，台阶

2. stairs

noun (common) (futsuumeishi)

地层，文化层

3. stage (in chronostratigraphy)

noun, used as a suffix noun (common) (futsuumeishi)

阶，层，数量词

4. counter for storeys and floors of a building

counter