Definitions
from The American Heritage® Dictionary of the English Language, 4th Edition
 n. Mathematics A regular solid having six congruent square faces.
 n. Something having the general shape of a cube: a cube of sugar.
 n. A cubicle, used for work or study.
 n. Mathematics The third power of a number or quantity.
 n. Slang Cubic inches. Used especially of an internal combustion engine.
 transitive v. Mathematics To raise (a quantity or number) to the third power.
 transitive v. To determine the cubic contents of.
 transitive v. To form or cut into cubes; dice.
 transitive v. To tenderize (meat) by breaking the fibers with superficial cuts in a pattern of squares.
from Wiktionary, Creative Commons Attribution/ShareAlike License
 n. A regular polyhedron having six identical square faces.
 n. Any object more or less in the form of a cube.
 n. The third power of a number, value, term or expression.
 n. A data structure consisting of a threedimensional array; a data cube
 v. To raise to the third power; to determine the result of multiplying by itself twice.
 v. To form into the shape of a cube.
 v. To cut into cubes.
 v. to use a Rubik's cube.
 n. A cubicle, especially one of those found in offices.
from the GNU version of the Collaborative International Dictionary of English
 n. A regular solid body, with six equal square sides.
 n. The product obtained by taking a number or quantity three times as a factor.
 transitive v. To raise to the third power; to obtain the cube of.
from The Century Dictionary and Cyclopedia
 n. In geometry, a regular body with six square faces; a rectangular parallelopiped, having all its edges equal.
 n. In arithmetic and algebra, the product obtained by multiplying the square of a quantity by the quantity itself; the third power of a quantity: as, 4 × 4 × 4 = 64, the cube of 4; a is the cube of a, or x of x.
 To raise to the cube or third power. See cube, n., 2.
 To measure the cubic capacity of a hollow object, like that of a skull.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 n. a threedimensional shape with six square or rectangular sides
 n. a hexahedron with six equal squares as faces
 n. the product of three equal terms
 v. cut into cubes
 v. raise to the third power
 n. any of several tropical American woody plants of the genus Lonchocarpus whose roots are used locally as a fish poison and commercially as a source of rotenone
 n. a block in the (approximate) shape of a cube
Etymologies
Examples

As you can see in the pictures attached below this design looks like a cube, but this cube is a table with four chair that you have to drag whenever needed.

DeadHorseBeater: your example about the cube is almost exactly why I hold the position I do.

The suspended cube is made of a metallic structure covered with wooden panels and the entire home is covered in white to add to its modern look.
Beautiful New Series of Wooden Furniture from Valentin Löllmann

PERSON_B: My cube is all silent now as it smokes its cigarette.

Then an extreme close up of a sugar cube is about to fall in the cup of coffee.

Wow, between this and the hangover cures, I see that folks in cube farms nationwide are really Getting Things Done.
Construct A Crossbow Out Of Office Supplies  Lifehacker Australia

The cube is a very good example because the cube inspire people, and that's what you can see, the cube is part of the new type of geometrical puzzles, mechanical puzzles, what we call twisty puzzles.

This NeXT cube is on display in a glass case at CERN.

As for its mystic meaning, the cube is symbol of wisdom, truth, moral perfection, at the origin itself of our civilization.

When I was working in cubefarmhell, one of my coworkers  who was one of his churches leaders  pointed out a quote from the New Testament that said homosexuals were cursed.
hernesheir commented on the word cube
767 Fifth Ave. New York City, NY 10153
The architects. The building.
October 11, 2011