Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 noun A polygon with six sides and six angles.
from The Century Dictionary.
 noun In geometry, a figure of six sides and six angles. If it be plane and the sides and angles are equal, it is a regular hexagon.
from the GNU version of the Collaborative International Dictionary of English.
 noun (Geom.) A plane figure of six angles.
 noun a hexagon in which the angles are all equal, and the sides are also all equal.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 noun A
polygon withsix sides and six angles.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 noun a sixsided polygon
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/ShareAlike License
Examples

You can see why the author chose a hexagonal grid for this encryption scheme: the hexagon is the mostsided polygon that yields a regular tessellation of the plane.
Wolfram Blog : Secret Codes in The Wolfram Demonstrations Project (But No Dinosaurs)

The hexagon is nearly 15,000 miles (25,000 kilometers) across.

Also, CNN will be using something called "Crimson Hexagon technology," which is critical, because the hexagon is the most scifi of all the polygons.
CNN's Election Night Will Be Full Of Mindbending Technological Overkill

Also, CNN will be using something called "Crimson Hexagon technology," which is critical, because the hexagon is the most scifi of all the polygons.
CNN's Election Night Will Be Full Of Mindbending Technological Overkill

Also, CNN will be using something called "Crimson Hexagon technology," which is critical, because the hexagon is the most scifi of all the polygons.
CNN's Election Night Will Be Full Of Mindbending Technological Overkill

Also, CNN will be using something called "Crimson Hexagon technology," which is critical, because the hexagon is the most scifi of all the polygons.
CNN's Election Night Will Be Full Of Mindbending Technological Overkill

Also, CNN will be using something called "Crimson Hexagon technology," which is critical, because the hexagon is the most scifi of all the polygons.
CNN's Election Night Will Be Full Of Mindbending Technological Overkill

Also, CNN will be using something called "Crimson Hexagon technology," which is critical, because the hexagon is the most scifi of all the polygons.
CNN's Election Night Will Be Full Of Mindbending Technological Overkill

Of the three figures, the hexagon is the most proper for convenience and strength.

The hexagon is a sixsided figure which, if inscribed in a circle, will have each of its sides equal to the radius of that circle (Fig. 206).
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