Dictionary.com
Thesaurus.com

orthonormal

American  
[awr-thuh-nawr-muhl] / ˌɔr θəˈnɔr məl /

adjective

Mathematics.
  1. (of a system of functions) normal; normalized.

  2. (of a set of vectors) having the properties that any two vectors are perpendicular and that each vector has a length of one unit.


Etymology

Origin of orthonormal

First recorded in 1930–35; ortho- + normal