Meaning of postdeterminer

post•de•ter•min•er

Pronunciation: (pōst"di-tûr'mu-nur), [key]
— n. Gram.
  1. a member of a subclass of English adjectival words, including ordinal and cardinal numbers, that may be placed after an article or other determiner and before a descriptive adjective, as first and three in the first three new chapters.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.