#89. Duality. -- N. duality, dualism; duplicity; biplicity[obs3], biformity[obs3]; polarity. two, deuce, couple, duet, brace, pair, cheeks, twins, Castor and Pollux, gemini, Siamese twins; fellows; yoke, conjugation; dispermy[obs3], doublets, dyad, span.
V. pair[unite in pairs], couple, bracket, yoke; conduplicate[obs3]; mate, span [U.S.].
Adj. two, twin; dual, dualistic, double; binary, binomial; twin, biparous[obs3]; dyadic[Math]; conduplicate[obs3]; duplex &c. 90; biduous[obs3], binate[obs3], diphyletic[obs3], dispermic[obs3], unijugate[obs3]; tete-a-tete.
coupled &c. v.; conjugate.
both, both the one and the other.