the quality or state of being heterogeneous; composition from dissimilar parts; disparateness.

1635–45; < Medieval Latin heterogeneitās. See heterogeneous, -ity

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World English Dictionary
heterogeneous (ˌhɛtərəʊˈdʒiːnɪəs)
1.  composed of unrelated or differing parts or elements
2.  not of the same kind or type
3.  chem Compare homogeneous of, composed of, or concerned with two or more different phases
[C17: from Medieval Latin heterogeneus, from Greek heterogenēs, from hetero- + genos sort]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

heterogeneity het·er·o·ge·ne·i·ty (hět'ə-rō'jə-nē'ĭ-tē)
The quality or state of being heterogeneous.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
heterogeneity [(het-uh-roh-juh-nee-uh-tee)]

Cultural, social, biological, or other differences within a group. (Compare homogeneity.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Among the calculations, he found that dynamical heterogeneity was a natural
  consequence of the theory.
But these findings mask a significant degree of heterogeneity along the gender
At the moment, it remains unclear what's driving this heterogeneity.
As a result, the stock market as a whole increasingly fails to reflect the
  vibrancy and heterogeneity of the broader economy.
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