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Noun: diffeomorphism
  1. (mathematics) an isomorphism of smooth manifolds:an invertible function that maps one differentiable manifold to another, such that both the function and its inverse are smooth
    "Once one has fixed the foliation and the time parametrization, the remaining diffeomorphism freedom is the coordinate freedom on the spatial hypersurfaces"

Derived forms: diffeomorphisms

Encyclopedia: Diffeomorphism