The term "main floor" refers to the ground level of a building where people typically enter and spend most of their time. It is the most accessible and commonly used floor in a structure. Full definition
The elderly should arrange to sleep on main floor with kitchen to stay in the loop. (bookings.mermaidcottages.com)
Many of the artists have taken over entire hospital rooms for solo presentations and site specific installations, with the two main floors of the exhibition divided in approach to human condition. (humanconditionexhibition.com)
Large windows throughout main floor with 18 - ft ceiling in living room and cozy natural gas fireplace. (deanbirks.com)