The phrase "fourth floor" refers to the level or storey of a building that is located above the ground floor, typically reached by climbing stairs or using an elevator. Full definition
Our meeting rooms are spread across ground floor to fourth floor so you can choose which level you would like to be at. (jurysinns.com)
Two bedroom, two bath partial ocean view fourth floor condo. (perfectplaces.com)
Located in the museum's fourth floor foyer gallery, the collection overlooks the lush, bustling sculpture garden beyond the exterior glass wall. (brooklynrail.org)