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pentagon

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Merriam-Webster's Collegiate DictionaryPentagonnoun ETYMOLOGY  the Pentagon building, headquarters of the Department of Defense DATE  1945: the United States military leadershippen·ta·gon \ˈpen-tə-ˌgän\ noun ETYMOLOGY  Greek pentagōnon, from neuter of pentagōnospentagonal, from penta- + gōnia angle — more at -gon DATE  1570: a polygon of five angles and five sidesEnglish Etymologypentagon  plane figure with five angles and five sides, 1570, from M.Frhttp://M.Fr.pentagone, from L.L. pentagonum "pentagon," from Gk.pentagonon, properly neut. of adj. pentagonos "five-angled," from pente "five" + gonia "angle" (see knee). The U.S. military headquarters Pentagon was completed 1942, so called for its shape; used allusively for "U.S. military leadership" from 1945.Oxford Advanced Learner's Dictionary-牛津双解-OALD7pentagonpenta·gon / 5pentE^En; NAmE -^B:n / noun1. [C] (geometry 几何) a flat shape with nine straight sides and nine angles   五边形；五角形2. the Pentagon [sing.] the building near Washington DC that is the headquarters of the US Department of Defence and the military leaders   五角大楼(指美国国防部):   a spokesman for the Pentagon    美国国防部发言人 Webster's Third New International Dictionary, UnabridgedSearch result show the entry is found in: pentagon crabpen·ta·gonI. \ˈpentə̇ˌgän, -tēˌ- sometimes -tə̇gən or -tēg-\ noun(-s)Etymology: Late Latin pentagonum, from Greek pentagōnon, from neuter of pentagōnos five-angled, from penta- + -gōnos (from gōnia angle) — more at -gon: a polygon having five sides — see area tableII. adjectiveUsage: usually capitalizedEtymology: from the Pentagon, pentagonal building (erected 1943) in Arlington Va., that is the headquarters of the United States Dept. of Defense and other government offices: of or relating to the Pentagon building especially as symbolizing the United States military, naval, and air force leadership concentrated there

Pentagon From Noun United States Angles The Building