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pentagon

noun
/ˈpentəɡən/
/ˈpentəɡɑːn/
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  1. [countable] (geometry几何) a flat shape with five straight sides and five angles五边形；五角形
    Topics Colours and Shapesc2
  2. the Pentagon
     [singular] the building near Washington DC that is the headquarters of the US Department of Defense and the military leaders五角大楼（指美国国防部）
    • a spokesman for the Pentagon美国国防部发言人
    Topics Politicsc2
    3. Word Originlate 16th cent.: via Latin from Greek pentagōnon, neuter (used as a noun) of pentagōnos ‘five-angled’.

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