Roget's Thesaurus: Entry 91 (Division into two parts)

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#91. [Division into two parts.] bisection. -- N. bisection, bipartition; dichotomy, subdichotomy[obs]; halving &c. v.; dimidiation[obs].

bifurcation, forking, branching, ramification, divarication; fork, prong; fold. half, moiety.

V. bisect, halve, divide, split, cut in two, cleave dimidiate[obs], dichotomize.

go halves, divide with.

separate, fork, bifurcate; branch off, out; ramify.

Adj. bisected &c. v.; cloven, cleft; bipartite, biconjugate[obs], bicuspid, bifid; bifurcous[obs], bifurcate, bifurcated; distichous, dichotomous, furcular[obs]; semi-, demi-, hemi[obs].