adjective Mathematics.

of, relating to, or having reference to two lines: bilinear coordinates.
of the first degree in each of two variables, as an equation.

Origin of bilinear

First recorded in 1850–55; bi-1 + linear Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for bilinear



of or referring to two lines
of or relating to a function of two variables that is linear in each independently, as f(x, y) = xy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for bilinear

also bi-linear, 1851, from bi- + linear. Related: Bilinearly; bilinearity.

Online Etymology Dictionary, © 2010 Douglas Harper