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BNC: 16353 COCA: 9191

pentagon

Word family
Related topics: Shapes, patterns, Maths
pentagon noun [countableC]  
CFa flat shape with five sides and five angles 五边形,五角形5 see picture at 见图 shape1
pentagonal /penˈtæɡənəl/ adjectiveadj
Examples from the Corpus
the PentagonPentagon, then  
nthe building in Washington DC from which the army, navy etc of the US are controlled, or the military officers who work in this building. It is called the Pentagon because it has a five-sided shape. On 11 September 2001 it was attacked by terrorists who flew a plane filled with passengers into it. 189 people were killed, including the 64 people who were on the plane.
pentagon nounPentagon, then
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