bilinear

adj

1. (not-comparable)Linear (preserving linear combinations) in each variable.

   “The function f(x,y)#61;xy is bilinear, because f(ax#43;bu,y)#61;af(x,y)#43;bf(u,y) and f(x,ay#43;bv)#61;af(x,y)#43;bf(x,v) for all values.”

2. (not-comparable)Of or pertaining to a Möbius transformation (type of conformal map representable as the ratio of two linear functions).

   “bilinear isotropic hardening”

noun

1. A bilinear function.