Dichotomy Di*chot"o*my, n. [Gr. ?, fr. ?: cf. F. dichotomie. See {Dichotomous}.] 1. A cutting in two; a division. [1913 Webster]

A general breach or dichotomy with their church. --Sir T. Browne. [1913 Webster]

2. Division or distribution of genera into two species; division into two subordinate parts. [1913 Webster]

3. (Astron.) That phase of the moon in which it appears bisected, or shows only half its disk, as at the quadratures. [1913 Webster]

4. (Biol.) 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. [1913 Webster]

5. The place where a stem or vein is forked. [1913 Webster]

6. (Logic) 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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.