orthonormal

adjective
or·tho·nor·mal | \ˌȯr-thə-ˈnȯr-məl \

Definition of orthonormal 

1 of real-valued functions : orthogonal with the integral of the square of each function over a specified interval equal to one

2 : being or composed of orthogonal elements of unit length orthonormal basis of a vector space

First Known Use of orthonormal

1928, in the meaning defined at sense 2

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The first known use of orthonormal was in 1928

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