dichotomy

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dichotomy

1. Logic the division of a class into two mutually exclusive subclasses
2. Botany a simple method of branching by repeated division into two equal parts
3. the phase of the moon, Venus, or Mercury when half of the disc is visible
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

dichotomy

(dÿ-kot -ŏ-mee) The moment of exact half-phase of the Moon, Mercury, or Venus.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

dichotomy

[dī′käd·ə·mē]
(astronomy)
The phase of the moon or an inferior planet at which exactly half of its disk is illuminated and the terminator is a straight line.
(biology)
Divided in two parts.
Repeated branching or forking.
(computer science)
A division into two subordinate classes; for example, all white and all nonwhite, or all zero and all nonzero.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.