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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Divided or dividing into two parts or classifications.
  2. adj. Characterized by dichotomy.

Century Dictionary and Cyclopedia

  1. Pertaining to or consisting of a pair or pairs; divided into two, or having a dual arrangement or order.
  2. Specifically— In botany, regularly dividing by pairs from below upward; two-forked: as, a dichotomous stem. A good example of a dichotomous stem is furnished by the mistletoe. See cut under dichotomy.
  3. In zoology:
  4. Branching by pairs; biramous; bifurcate; forked: as, the dichotomous division of a deer's antlers; the dichotomous foot of a crustacean.
  5. Distichous; bifarious; two-rowed or two-ranked; parted in the middle: as, the dichotomous hairs of a squirrel's tail.
  6. In classification, binary; dual; arranged in two ranks or series; opposed by pairs, as a set of characters, or a number of objects characterized by dichotomization. Also dichotomic.

Wiktionary

  1. adj. Dividing or branching into two pieces.

GNU Webster's 1913

  1. adj. Regularly dividing by pairs from bottom to top.

WordNet 3.0

  1. adj. divided or dividing into two sharply distinguished parts or classifications

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‘dichotomous’ has been looked up 1583 times, loved by 4 people, added to 9 lists, and has a Scrabble score of 19.