Yes, you can use flat directly in your web browser without downloading or installing software. Level, flat, plane, even, smooth mean having a surface without bends, curves, or irregularities. A flat is a set of rooms for living in, usually on one floor and part of a larger building.
A flat usually includes a kitchen and bathroom. Flat generally refers to a surface or object that is level, smooth, and has no curvature or bumps. A flat is an apartment.
It's called a flat because all the rooms in it are usually on the same floor. The word flat is much more common in british than american english. On or up against a flat surface;
So as to be flat. Went flat against the rules; He was flat on the canvas after the.