/ˈpentəgən; US -gɒn ||; ˈpɛntəˌgɑn/noun1 [C] a shape that has five straight and equal sides 五边形;五角形
2 the Pentagon [sing] a large government building near Washington DC in the US that contains the main offices of the US military forces; the military officials who work there 五角大楼(美国国防部办公大楼);美国国防部人员