also: さんかい
third floor; third storey
Refers to the third floor of a building. In Japanese floor counting, the ground floor is 一階 (いっかい), so 三階 is two floors above ground level.
The toy department is on the third floor of the department store.
This building is three storeys tall.
The bookstore is on the third floor.
I went up to the third floor by elevator.
I came down from the third floor using the stairs.
This house has three storeys.