Pentagon(redirected from pentagonally)
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a polygon having five sides
1. the five-sided building in Arlington, Virginia, that houses the headquarters of the US Department of Defense
2. the military leadership of the US
the pentagonal building near Washington, D.C., in Virginia, that is the headquarters of the US Department of Defense. In the broad sense, the term refers to the US Department of Defense, which exercises an enormous influence on US policy.
A polygon with five sides.