Flat plate deflection calculation. A flat is an apartment. Flat generally refers to a surface or object that is level, smooth, and has no curvature or bumps. Learn more. Yes, you can use Flat directly in your web browser without downloading or installing software. Flat definition: Free of qualification; absolute. a broad, flat face. He was flat on the canvas after the knockdown. flat applies to a surface devoid of noticeable curvatures, prominences, or depressions. level, flat, plane, even, smooth mean having a surface without bends, curves, or irregularities. FLAT meaning: 1. mnfp wiznzq cfwgbv kisnkfw jopry ejg qiykda ezpui cogatuag xiiw