Flatness may refer to: Flatness (art) Flatness (cosmology) Flatness (liquids) Flatness (manufacturing), a geometrical tolerance required in certain manufacturing situations Flatness (systems theory), a property of nonlinear dynamic systems Spectral flatness Flat function in mathematical analysis Flat intonation Flat module in abstract algebra Flat morphism in algebraic geometry
See also Flat (disambiguation) Flattening