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From: WordNet (r) 2.0

 Pr
      n 1: a soft yellowish-white trivalent metallic element of the
           rare earth group; can be recovered from bastnasite or
           monazite by an ion-exchange process [syn: praseodymium,
            atomic number 59]
      2: a self-governing commonwealth associated with the United
         States occupying the island of Puerto Rico [syn: Puerto
         Rico, Porto Rico, Commonwealth of Puerto Rico]
      3: a promotion intended to create goodwill for a person or
         institution [syn: public relations]