W: (adj) parallel [Indirect via oblique] (being everywhere equidistant and not intersecting) "parallel lines never converge"; "concentric circles are parallel"; "dancers in two parallel rows"
W: (adj) perpendicular [Indirect via oblique] (intersecting at or forming right angles) "the axes are perpendicular to each other"
S: (adj) orthogonal, rectangular (having a set of mutually perpendicular axes; meeting at right angles) "wind and sea may displace the ship's center of gravity along three orthogonal axes"; "a rectangular Cartesian coordinate system"
S: (adj) right (having the axis perpendicular to the base) "a right angle"