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Oxford dictionary definition of the word cubic:

adjective

1having the shape of a cube:

a cubic room

denoting a crystal system or three-dimensional geometrical arrangement having three equal axes at right angles:

the sodium and chloride ions form two intersecting cubic structures

2denoting a unit of measurement equal to the volume of a cube whose side is one of the linear units specified:

15 billion cubic metres of water

3involving the cube (and no higher power) of a quantity or variable:

a cubic equation

noun

Mathematics

a cubic equation, or a curve described by one.

Derivatives

cubical

adjective

cubically

adverb