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Definition of pentagon noun from the Oxford Advanced Learner's Dictionary

pentagon

noun
 
/ˈpentəɡən/
 
/ˈpentəɡɑːn/
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  1. [countable] (geometry) a flat shape with five straight sides and five anglesTopics 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
    • a spokesman for the Pentagon
    Topics Politicsc2
    3. Word Originlate 16th cent.: via Latin from Greek pentagōnon, neuter (used as a noun) of pentagōnos ‘five-angled’.
See pentagon in the Oxford Advanced American Dictionary
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alloy
noun
 
 
From the Topic
Physics and chemistry
C2
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