| Mawson, C.O.S., ed. (18701938). Rogets International Thesaurus. 1922. |
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| Class II. Words Relating to Space | | Section II. Dimensions | | 2. Linear Dimensions |
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| 216. Parallelism. |
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| NOUN: | PARALLELISM, coextension, equidistance, concentricity; collimation.
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| VERB: | BE PARALLEL &c. adj.; parallel, equal; collimate.
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| ADJECTIVE: | PARALLEL, coextensive, equidistant, collateral, concentric, concurrent; abreast, aligned, equal, even, alongside.
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| ADVERB: | alongside (laterally) [See Laterality].
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