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Noun
affine transformation
Definition: (mathematics) a transformation that is a combination of single transformations such as translation or rotation or reflection on an axis
Definition: A geometric transformation that preserves lines and parallelism, but in general not lengths or angles; (more formally) an automorphism of an affine space: a mapping of an affine space onto itself that preserves both the dimension of any affine subspace and the ratio of the lengths of any pair of parallel line segments.