Adjective
(computing, of a keyboard) Having keys that are aligned in a perfect grid.
Having all turns occurring at right angles.
Forming a line when plotted on a set of orthogonal axes.
Defining progress as one-dimensional, so that change is either a progression, a regression, or a neutral step to the side.
Moving in one direction, in which each step leads to the next.
Source: en.wiktionary.org