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Linear with respect to each of two variables or positions. Used of functions or equations.
1. (Mathematics) of or referring to two lines
2. (Mathematics) of or relating to a function of two variables that is linear in each independently, as f(x, y) = xy
bi•lin•e•ar(baɪˈlɪn i ər)
1. of or pertaining to two lines: bilinear coordinates.
2. of the first degree in each of two variables.