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Meaning of proper noun

prop'er noun'

Pronunciation: [key]
  1. a noun that is not normally preceded by an article or other limiting modifier, as any or some, and that is arbitrarily used to denote a particular person, place, or thing without regard to any descriptive meaning the word or phrase may have, as Lincoln, Beth, Pittsburgh. Also calledCf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.