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Noun pr has 3 senses
  1. praseodymium, Pr, atomic number 59 - a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process
    --1 is a kind of metallic element, metal
    --1 is a substance of bastnasite, bastnaesite; monazite
  2. Puerto Rico, Porto Rico, Commonwealth of Puerto Rico, PR - a self-governing commonwealth associated with the United States occupying the island of Puerto Rico
    --2 is a kind of commonwealth
    --2 is a part of Greater Antilles; Caribbean
    --2 has parts: Puerto Rico, Porto Rico; San Juan; Culebra; Vieques
  3. public relations, PR - a promotion intended to create goodwill for a person or institution
    --3 is a kind of promotion, publicity, promotional material, packaging
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