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 pentagon pentagon /ˈpɛnɪˌgɑːn/

noun

  1. A five-sided polygon  ( pentagon )
    a five-sided polygon
     A pentagon has five sides
    A pentagon has five sides

 Pentagon

  1. () A government building with five sides that serves as the headquarters of the United States Department of Defense  ( The Pentagon , Pentagon )
    a government building with five sides that serves as the headquarters of the United States Department of Defense
     The Pentagon in Washington D.C. is a symbol of the US military's might.
    The Pentagon in Washington D.C. is a symbol of the US military's might.
  2. () (military) the United States military establishment  ( Pentagon )
    (military) the United States military establishment