1. (n.) A cutting in two; a division.

2. (n.) Division or distribution of genera into two species; division into two subordinate parts.

3. (n.) That phase of the moon in which it appears bisected, or shows only half its disk, as at the quadratures.

4. (n.) Successive division and subdivision, as of a stem of a plant or a vein of the body, into two parts as it proceeds from its origin; successive bifurcation.

5. (n.) The place where a stem or vein is forked.

6. (n.) Division into two; especially, the division of a class into two subclasses opposed to each other by contradiction, as the division of the term man into white and not white.

Janus abscission ambiguity ambivalence amputation bifidity biformity bifurcation bipartition bisection branching butchering by two chopping cleavage conjugation cutting cutting in two dimidiation division doubleness doublethink doubling dualism duality duplexity duplication duplicity enucleation equivocality excision fission forking halving in half irony laceration mutilation pairing polarity ramification rending resection ripping scission section severance slashing slicing splitting subdivision surgery tearing twinning two-facedness twoness