Wiktionary
n. An interior of a building constructed with few walls or obstructions, giving a communal aspect.
Usage examples of "open floor plan".
The living room was small, but the open floor plan and a spare arrangement of furniture made it feel larger.
The windows we left open suck air inside, and the easy-living open floor plan channels this airstream out through the front doors.
Huge planters full of dark green foliage that could flourish in the dimmer light surrounded them to give a measure of privacy that the large open floor plan lacked.
It was a large space, but I'm not really comfortable with the open floor plan.
In this open floor plan, the family room flowed into the kitchen with only a breakfast bar intervening.
The town house had an open floor plan with almost the entire downstairs visible from the doorway.