The Heterogeneous reference article from the English Wikipedia on 24-Apr-2004
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Heterogeneous

The term heterogeneous refers to a compound, mixture, or other such object that consists of many different items. It is the antonym of homogeneous, which means that the object consists of many identical items. It is often used in a scientific or mathematical context.

See also: homogenization, heterozygous, homozygous.