Having many lines. / Having many linear aspects. / (mathematics, of a function etc) That is linear in each variable separately.

The state or condition of being multilinear.

plural of multilinearity

plural of multilinear form

(linear algebra, multilinear algebra) Given a vector space V over a field K of scalars, a mapping Vᵏ → K that is linear in each of its arguments;

In a multilinear way.