Roget's Thesaurus: Entry 216 (Parallelism)

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#216. Parallelism. -- N. {ant. 216a} parallelism; coextension[obs]; equidistance[obs]; similarity &c. 17.

Adj. parallel; coextensive; equidistant.

Adv. alongside &c. (laterally) 236. #216a. Perpendicularity -- N. {ant. 216} perpendicularity, orthogonality; verticality, &c. 212.

V. be perpendicular, be orthogonal; intersect at right angles, be rectangular, be at right angles to, intersect at 90 degrees; have no correlation.

Adj. orthogonal, perpendicular; rectangular; uncorrelated.