Duality
Nouns
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duality, dualism
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duplicity
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biplicity, biformity
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polarity. two, deuce, couple, duet, brace, pair, cheeks, twins, Castor and Pollux, gemini, Siamese twins
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fellows
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yoke, conjugation
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dispermy, doublets, dyad, span.
Verbs
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pair [unite in pairs], couple, bracket, yoke
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conduplicate
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mate, span [U.S.].
Adjectives
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two, twin
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dual, dualistic, double
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binary, binomial
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twin, biparous
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dyadic [Math.]
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conduplicate
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duplex etc. Duplication
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biduous, binate, diphyletic, dispermic, unijugate
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tete-a-tete. coupled etc. v.
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conjugate. both, both the one and the other.