couple with. 
     Adj. accompanying &c. v.; concomitant, fellow, twin, joint; associated
with, coupled with; accessory, attendant, obbligato. 
     Adv. with, withal; together with, along with, in company with; hand in
hand, side by side; cheek by jowl, cheek by jole[obs3]; arm in arm; therewith, herewith; and &c. (addition) 37.
     together, in a body, collectively. 
     Phr. noscitur a sociis[Lat]; virtutis fortuna comes[Lat].

     #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.

     #90.  Duplication. —­ N. duplication; doubling &c. v.; gemination,
ingemination[obs3]; reduplication; iteration &c. (repetition) 104; renewal. 
     V. double, redouble, duplicate, reduplicate; geminate; repeat &c. 104;
renew &c. 660. 
     Adj. double; doubled &c. v.; bicipital[obs3], bicephalous[obs3],
bidental[obs3], bilabiate, bivalve, bivalvular[obs3], bifold[obs3], biform[obs3], bilateral; bifarious[obs3], bifacial[obs3]; twofold, two-sided; disomatous[obs3]; duplex; double-faced, double-headed; twin, duplicate, ingeminate[obs3]; second. 
     Adv. twice, once more; over again &c. (repeatedly) 104; as much again,
twofold; secondly, in the second place, again.

     #91. [Division into two parts.] bisection. —­ N. bisection,
bipartition; dichotomy, subdichotomy[obs3]; halving &c. v.;
dimidiation[obs3].
     bifurcation, forking, branching, ramification, divarication; fork,
prong; fold; half, moiety. 
     V. bisect, halve, divide, split, cut in two, cleave dimidiate[obs3],
dichotomize.
     go halves, divide with.
     separate, fork, bifurcate; branch off, out; ramify. 
     Adj. bisected &c. v.; cloven, cleft; bipartite, biconjugate[obs3],
bicuspid, bifid; bifurcous[obs3], bifurcate, bifurcated; distichous, dichotomous, furcular[obs3]; semi-, demi-, hemi[obs3].

<—­ p. 29 —­>

     #92.  Triality. —­ N. Triality[obs3], trinity; triunity[obs3].
     three, triad, triplet, trey, trio, ternion[obs3], leash; shamrock,
tierce[obs3], spike-team [U.S.], trefoil; triangle, trident, triennium[obs3], trigon[obs3], trinomial, trionym[obs3], triplopia[obs3], tripod, trireme, triseme[obs3], triskele[obs3], triskelion, trisula[obs3].
     third power, cube; cube root. 
     Adj. three; triform[obs3], trinal[obs3], trinomial; tertiary;
ternary; triune; triarch, triadie[obs3]; triple &c. 93. 
     Pref. tri-, tris-. 
     Phr. tria juncta in uno[Lat].