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



    BrE BrE//ˈpentəɡən//
    ; NAmE NAmE//ˈpentəɡɑːn//
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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 DC that is the headquarters of the US Department of Defense and the military leaders a spokesman for the Pentagon
  3. Word Originlate 16th cent.: via Latin from Greek pentagōnon, neuter (used as a noun) of pentagōnos ‘five-angled’.
See the Oxford Advanced American Dictionary entry: pentagon

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