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Definition of pentagon noun from the Oxford Advanced American Dictionary

     

    pentagon

     noun
    noun
    NAmE//ˈpɛntəˌɡɑn//
     
     
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  1. 1[countable] (geometry) a flat shape with five straight sides and five angles
  2. 2the Pentagon [singular] the building near Washington D.C. that is the headquarters of the Department of Defense and military leaders a spokesman for the Pentagon
See pentagon in the Oxford Advanced Learner's Dictionary
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