bilinear

[bahy-lin-ee-er]
adjective Mathematics.
1.
of, pertaining to, or having reference to two lines: bilinear coordinates.
2.
of the first degree in each of two variables, as an equation.

Origin:
1850–55; bi-1 + linear

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World English Dictionary
bilinear (baɪˈlɪnɪə)
 
adj
1.  of or referring to two lines
2.  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 10th Edition
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Example sentences
All digital rotations were done using bilinear interpolation.
Bilinear interpolation uses known values at corners of a rectangle to compute unknown values within the rectangle.
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