Etymology
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PR (n.)

also P.R.; 1942, abbreviation of public relations (see public (adj.) ).

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Definitions of PR
1
pr (n.)
a self-governing commonwealth associated with the United States occupying the island of Puerto Rico;
Synonyms: Puerto Rico / Porto Rico / Commonwealth of Puerto Rico
pr (n.)
a promotion intended to create goodwill for a person or institution;
Synonyms: public relations
2
Pr (n.)
a soft yellowish-white trivalent metallic element of the rare earth group; can be recovered from bastnasite or monazite by an ion-exchange process;
Synonyms: praseodymium / atomic number "
From wordnet.princeton.edu