transformational grammar

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A grammar that accounts for the constructions of a language by linguistic transformations and phrase structures, especially a generative grammar.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun linguistics A generative grammar, especially of a natural language, developed in the Chomskyan tradition of phrase structure grammars (as opposed to dependency grammars).