[awr-thuh-nawr-muh l]

adjective Mathematics.

(of a system of functions) normal; normalized.
(of a set of vectors) having the properties that any two vectors are perpendicular and that each vector has a length of one unit.

Origin of orthonormal

First recorded in 1930–35; ortho- + normal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019