| Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922. |
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| Class I. Words Expressing Abstract Relations | | Section V. Number | | 2. Determinate Number |
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| 89. Duality |
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| NOUN: | DUALITY, dualism; duplicity; biplicity [rare], biformity; polarity.
two, deuce, couple, couplet, both, twain, brace, pair, cheeks, twins, Castor and Pollux, gemini, Siamese twins; fellows; yoke, conjugation; dispermy, doublets, dyad, duad, twosome [rare], distich, span.
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| VERB: | [UNITE IN PAIRS] pair, couple, bracket, yoke; conduplicate; mate, span [U. S.]
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| ADJECTIVE: | TWO, twain; dual, dualistic; binary, binomial; twin, biparous; dyadic; conduplicate; duplex [See Duplication]; biduous, binate, binary, binal [rare], diphyletic, dispermic, paired, unijugate; tête-à-tête [F.].
COUPLED &c. v.; conjugate.
BOTH, both the one and the other.
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