Adjacent Words

Pentagon definitions

	Tweet

Webster's 1828 Dictionary

PEN'TAGON, n. [Gr. five, and a corner.]
1. In geometry, a figure of five sides and five angles.
2. In fortification, a fort with five bastions.

WordNet (r) 3.0 (2005)

n
1: a government building with five sides that serves as the headquarters of the United States Department of Defense
2: the United States military establishment
3: a five-sided polygon

Merriam Webster's

noun Etymology: Greek pentag?non, from neuter of pentag?nos pentagonal, from penta- + g?nia angle — more at -gon Date: 1570 a polygon of five angles and five sides

Merriam Webster's

noun Etymology: the Pentagon building, headquarters of the Department of Defense Date: 1945 the United States military leadership

Oxford Reference Dictionary

n. 1 a plane figure with five sides and angles. 2 (the Pentagon) a the pentagonal Washington headquarters of the US defence forces. b the leaders of the US defence forces. Derivatives: pentagonal adj. Etymology: F pentagone or f. LL pentagonus f. Gk pentagonon (as PENTA-, -GON)

Webster's 1913 Dictionary

Pentagon Pen"ta*gon, n. [Gr. ?; ? (see Penta-) + gwni`a angle: cf. L. pentagonium, F. pentagone.] (Geom.) A plane figure having five angles, and, consequently, five sides; any figure having five angles. Regular pentagon, a pentagon in which the angles are all equal, and the sides all equal.

Collin's Cobuild Dictionary

(pentagons) A pentagon is a shape with five sides. N-COUNT

Collin's Cobuild Dictionary

The Pentagon is the main building of the US Defense Department, in Washington. The US Defense Department is often referred to as the Pentagon. ...a news conference at the Pentagon... N-PROPER: the N, N n