bilinear

adjective
bi·lin·ear | \(ˌ)bī-ˈli-nē-ər \

Definition of bilinear 

: linear with respect to each of two mathematical variables specifically : of or relating to an algebraic form each term of which involves one variable to the first degree from each of two sets of variables

First Known Use of bilinear

1749, in the meaning defined above

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The first known use of bilinear was in 1749

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not any or not one

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