|organism that has a nucleus containing genetic material|
|male reproductive structure which produces gametes in ferns, mosses, fungi and algae|
|—n , pl -mies|
|1.||division into two parts or classifications, esp when they are sharply distinguished or opposed: the dichotomy between eastern and western cultures|
|2.||logic the division of a class into two mutually exclusive subclasses: the dichotomy of married and single people|
|3.||botany a simple method of branching by repeated division into two equal parts|
|4.||the phase of the moon, Venus, or Mercury when half of the disc is visible|
|[C17: from Greek dichotomia; see |
|usage Dichotomy should always refer to a division of some kind into two groups. It is sometimes used to refer to a puzzling situation which seems to involve a contradiction, but this use is generally thought to be incorrect|
(from Greek dicha, "apart," and tomos, "cutting"), a form of logical division consisting of the separation of a class into two subclasses, one of which has and the other has not a certain quality or attribute. Men thus may be divided into professional men and men who are not professionals; each of these may be subdivided similarly. On the principle of contradiction this division is both exhaustive and exclusive; there can be no overlapping, and no members of the original genus or the lower groups are omitted. This method of classification, though formally accurate, has slight value in the exact sciences, partly because at every step one of the two groups is merely negatively characterized and is usually an artificial, motley class; but it sets forth clearly the gradual descent from the most inclusive genus (summum genus) through species to the lowest class (infima species), which is divisible only into individual persons or things.
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