Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.
Class II. Words Relating to SpaceSection II. Dimensions
2. Linear Dimensions
216. Parallelism.
NOUN:PARALLELISM, coextension, equidistance, concentricity; collimation.VERB:BE PARALLEL &c. adj.; parallel, equal; collimate.
ADJECTIVE:PARALLEL, coextensive, equidistant, collateral, concentric, concurrent; abreast, aligned, equal, even, alongside.
ADVERB:alongside (laterally) [See Laterality].