Meaning of prepositive

pre•pos•i•tive

Pronunciation: (prē-poz'i-tiv), [key]
— Gram. Gram.
—adj.
  1. (of a word) placed before another word to modify it or to show its relation to other parts of the sentence. In red book, red is a prepositive adjective. John's in John's book is a prepositive genitive.
—n.
  1. a word placed before another as a modifier or to show its relation to other parts of the sentence.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.