There are eight gluons. Six--modulo superposition--are sensible color-anticolor color swappers. The other two are fathomless mixtures that can only be described as the remaining linearly independent elements of the group of three-by-three complex unitary matrices with determinant one.
Source: tatoeba (2125774)
The dimension of a vector space equals the largest number of its elements that can be linearly independent.
Source: tatoeba (2125780)
The effect related linearly to the amount of causative agent added.
Source: wiktionary
Furthermore, the multipreconditioned search space is shown to grow only linearly with the number of preconditioners.
Source: wiktionary