dictionary.reference.com/browse/orthogonal

en.wikipedia.org/wiki/Orthogonality

In mathematics, orthogonality is the relation of two lines at right angles to one another ... In certain cases, the word normal is used to mean orthogonal, particularly in the geometric sense as in the normal to a surface. ..... frequency spacing needed to make them orthogonal so that they do not interfere with each other.

mathworld.wolfram.com/OrthogonalVectors.html

(i.e., the vectors are perpendicular) are said to be orthogonal. ... From MathWorld --A Wolfram Web Resource. http://mathworld.wolfram.com/OrthogonalVectors.

stats.stackexchange.com/questions/12128/what-does-orthogonal-mean-in-the-context-of-statistics

In other contexts, orthogonal means "at right angles" or "perpendicular". ... It means they [the random variables X,Y] are 'independent' to each other. Independent ...

searchstorage.techtarget.com/definition/orthogonal

Mar 10, 2015 ... The orthogonal definition also has been extended to general use, ... Thus, motion by one vector along an orthogonal X-Y axis does not ...

www.vocabulary.com/dictionary/orthogonal

Two lines that are orthogonal are perpendicular or intersecting at a right angle, ... it also describes events that are statistically independent, or do not affect one ...

www.quora.com/What-is-the-difference-between-orthogonal-normal-and-perpendicular-when-dealing-with-vectors

TL;DR: The term perpendicular describes a property of two vectors, orthogonal is a related ... has nothing to do with orthogonality, and the fact that such a matrix is called orthogonal instead of orthonormal is historical baggage). ... Sometimes people say one vector is normal to another, and that means the same thing, too.

www.merriam-webster.com/dictionary/orthogonal

1a : intersecting or lying at right angles In orthogonal cutting, the cutting edge is perpendicular to the direction of tool travel.b : having perpendicular slopes or ...