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WordReference Random House Unabridged Dictionary of American English © 2016
transforma′tional rule′, [Ling.]a rule of transformational grammar that relates two phrase markers in the course of a derivation from the deep to the surface syntactic representation of a sentence, as by reordering, inserting, or deleting elements;
a rule that converts deep structures into surface structures.
Collins Concise English Dictionary © HarperCollins Publishers::
transformational rule n
- a rule that converts one phrase marker into another. Taken together, these rules, which form the transformational component of the grammar, convert the deep structures of sentences into their surface structures
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