A multilinear function, form, or similar object is linear in each of its variables separately.
Multilinear
See also
Bilinear Function, Linear Operator, Multilinear Form, Multilinear PolynomialExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Multilinear." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Multilinear.html