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1. having the shape of a cube
a. having three dimensions
b. denoting or relating to a linear measure that is raised to the third power
3. Maths of, relating to, or containing a variable to the third power or a term in which the sum of the exponents of the variables is three
4. Crystallog relating to or belonging to the crystal system characterized by three equal perpendicular axes. The unit cell of cubic crystals is a cube with a lattice point at each corner (simple cubic) and one in the cube's centre (body-centred cubic), or a lattice point at each corner and one at the centre of each face (face-centred cubic).
a. a cubic equation, such as x3 + x + 2 = 0
b. a cubic term or expression
Denoting a unit of volume, so that if x is a unit of length, a cubic x is the volume of a cube whose sides have length 1 x ; for example, a cubic meter, or a meter cubed, is the volume of a cube whose sides have a length of 1 meter. Abbreviated cu.