THESAURUS
halving
Janus, ambiguity, ambivalence, bifidity, biformity, bifurcation, bipartition, bisection, branching, by two, conjugation, cutting in two, dichotomy, dimidiation, division, doubleness, doublethink, doubling, dualism, duality, duplexity, duplication, duplicity, equivocality, forking, in half, irony, pairing, polarity, ramification, subdivision, twinning, two-facedness, twoness
ROGET THESAURUS
halving
bisection
N
bisection, bipartition, dichotomy, subdichotomy,
halving, dimidiation, bifurcation, forking, branching, ramification, divarication, fork, prong, fold, half, moiety, bisected, cloven, cleft, bipartite, biconjugate, bicuspid, bifid, bifurcous, bifurcate, bifurcated, distichous, dichotomous, furcular, semi-, demi-, hemi.