orthogonal
adjective
°pertaining to right angles; perpendicular (to).
"A chord and the radius that bisects it are orthogonal."
°# Of two functions, linearly independent; having a zero inner product.
parallel
adjective
°Of two or more (straight) lines, (flat) surfaces etc: Equally distant from one another at all points.
"The horizontal lines on my notebook paper are parallel."
°(computing) Describing the processing of multiple tasks at the same time.
verb
°With a parallel relationship.
°To construct something parallel to something else.
noun
°One of a set of parallel lines.
°A line of latitude.