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Meaning of extraposition

ex•tra•po•si•tion

Pronunciation: (ek"stru-pu-zish'un), [key]
— n. Ling.
  1. a rule of transformational grammar that shifts a subordinate or modifying clause to the end of a sentence, as in changing That you sign the paper is necessary to It is necessary that you sign the paper.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.