ex·​tra·​position | \¦ekstrə+\

Definition of extraposition 

: a transformation in which a syntactic constituent (such as a noun phrase or sentence) is moved outside of the constituent that contains it especially : one in which a subject that is a sentence which has itself undergone a transformation is so moved and leaves behind the pronoun it

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History and Etymology for extraposition

extra- + position

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to enclose within walls

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