The content of the message should be orthogonal to the means of its delivery.
A chord and the radius that bisects it are orthogonal.
The number of independent primitive concepts has been minimized in order that the language be easy to describe, to learn, and to implement. On the other hand, these concepts have been applied “orthogonally” in order to maximize the expressive power of the language while trying to avoid deleterious superfluities.
... orthogonal technology strategies. ...