1. adjective /ˈkjuː.bɪk/
a) Used in the names of units of volume formed by multiplying a unit of length by itself twice. <!note: this is correct; although there are three factors, there are only two multiplications
cubic metre, cubic foot
b) Of a class of polynomial of the form
2. noun /ˈkjuː.bɪk/
A cubic curve.
Wikipedia foundation.