WordReference Random House Unabridged Dictionary of American English © 2020
deep structure, [Ling.]
  1. Linguistics(in transformational-generative grammar) the underlying semantic or syntactic representation of a sentence, from which the surface structure may be derived. Cf. surface structure.
  • 1960–65, American.

Collins Concise English Dictionary © HarperCollins Publishers::
deep structure n
  1. a representation of a sentence at a level where logical or grammatical relations are made explicit, before transformational rules have been applied
    Compare surface structure
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