noun

1. a transforming or being transformed
2. Now Rare a woman's wig
3. ☆ Linguis.
   1. the process of changing, by the application of certain syntactic rules, an abstract underlying structure into a surface structure
   2. any of the rules that derive surface structures from abstract underlying structures
      also transformational rule
4. Math. the process of setting up correspondences between the elements of two sets or spaces so that every element of the first set corresponds to a unique element of the second set

Etymology: LL(Ec) transformatio