Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
 adjective Having the shape of a cube.
 adjective Shaped similar to a cube.
 adjective Having three dimensions.
 adjective Having a volume equal to a cube whose edge is of a stated length.
 adjective Mathematics Of the third power, order, or degree.
 adjective Of or relating to a crystalline form that has three equal axes at right angles to each other; isometric.
 noun A cubic expression, curve, or equation.
from The Century Dictionary.
 Having the form of a cube.
 Solid; threedimensional: said of a unit of volume related to a unit of length of the same name as a cube is related to its edge. Thus, a cubic yard is the volume or solid contents of a cube whose edges are each a yard long. Abbreviated c.
 In algebra and geometry, being of the third order, degree, or power.
 noun In mathematics, a cubical quantic, equation, or curve.
from the GNU version of the Collaborative International Dictionary of English.
 noun (Geom.) A curve of the third degree.
 noun See under
Circular .  adjective Having the form or properties of a cube; contained, or capable of being contained, in a cube.
 adjective (Crystallog.) Isometric or monometric. See
Crystallization .  adjective an equation in which the highest power of the unknown quantity is a cube.
 adjective a volume equivalent to a cubical solid which measures a foot in each of its dimensions.
 adjective a number produced by multiplying a number into itself, and that product again by the same number. See
Cube .  adjective (Geom.) two curves of the third degree, one plane, and one on space of three dimensions.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective geometry Used in the names of units of volume formed by multiplying a unit of length by itself twice.
 adjective algebraic geometry Of a class of
polynomial of the form  adjective crystallography Having three equal axes and all angles 90°.
 noun algebraic geometry A
cubic curve .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
 adjective having three dimensions
Etymologies
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Examples

The 392 designation comes from the engine's size in cubic inches, a measurement familiar to those of us raised in the muscle car era, many of whom are the Challenger's target demographic.

To recap: Optogenetics can trigger neurons within a carefully limited area, that is, a cubic millimeter or two.
World Wide Mind Michael chorost 2011

To recap: Optogenetics can trigger neurons within a carefully limited area, that is, a cubic millimeter or two.
World Wide Mind Michael chorost 2011

I've seen several references to a unit of energy called the cubic mile of oil (CMO).
tingilinde: 2008

Aluminum is cubic, which is based on squares, so Keo was right.
BSNYC Product Review: Bicycle Book Shootout! BikeSnobNYC 2009

Halite crystallizes in the isometric (also called cubic) crystal system and when it forms crystals, it generally forms cubes.
Halite 2008

The primary objective is to increase productivity, or pulp yield, defined as cubic meters of pulp grown per hectare of plantation.
The Emerging Markets Century Antoine van Agtmael 2007

The latter, commonly called cubic nitre or Chile saltpetre, is the kind occurring in Chile.
Commercial Geography A Book for High Schools, Commercial Courses, and Business Colleges 1895

Cent. has a greater weight under a given volume (that is, a cubic unit of it is heavier at this temperature) than it is at any temperature either higher or lower.

Most doctors define mild neutropenia as neutrophil levels from 1000 to 1500 neutrophils per milliliter (onethousandth of a liter; also called a cubic centimeter) of blood.
CancerConsultants 2010
hilart commented on the word cubic
I use this word a lot at work. I drive a cement truck.
October 22, 2008
fbharjo commented on the word cubic
cubicle  repeated cubes
September 20, 2011