Before revision: Geometric transformations can be distinguished into two types: active or alibi transformations which change the physical position (alibi means " elsewhere ") of a set of points relative to a fixed frame of reference or coordinate system; and passive or alias transformations which leave points fixed but change the frame of reference or coordinate system relative to which they are described (alias means " other name").
After revision: Geometric transformations can be distinguished into two types: active or alibi transformations which change the physical position (alibi meaning " being somewhere else at the same time ") of a set of points relative to a fixed frame of reference or coordinate system; and passive or alias transformations which leave points fixed but change the frame of reference or coordinate system relative to which they are described (alias meaning " going under a different name").