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Affine, definition from Wolfram MathWorld "The adjective "affine" indicates everything that is related to the geometry of affine spaces. A coordinate system for the n-dimensional affine space R^n is determined by any basis of n vectors, which are not necessarily orthonormal. Therefore, the resulting axes are not necessarily mutually perpendicular nor have the same unit measure. In this sense, affine is a generalization of Cartesian or Euclidean. "

See the homepage: http://www.symmetrymagazine.org/cms/ symmetry is a magazine about particle physics and its connections to other aspects of life and science, from interdisciplinary collaborations to policy to culture. It is published 6 times per year by Fermi National Accelerator Laboratory and SLAC National Accelerator Laboratory, both national laboratories funded by the Office of Science of the US Department of Energy.