[huh-mol-uh-jee, hoh-]
noun, plural homologies.
the state of being homologous; homologous relation or correspondence.
a fundamental similarity based on common descent.
a structural similarity of two segments of one animal based on a common developmental origin.
Chemistry. the similarity of organic compounds of a series in which each member differs from its adjacent compounds by a fixed increment, as by CH 2 .
Mathematics. a classification of figures according to certain topological properties.

1650–60; < Greek homología agreement, equivalent to homólog(os) homologous + -ia -y3

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World English Dictionary
homology (həʊˈmɒlədʒɪ)
n , pl -gies
1.  the condition of being homologous
2.  chem the similarities in chemical behaviour shown by members of a homologous series
3.  zoology the measurable likenesses between animals, as used in grouping them according to the theory of cladistics
[C17: from Greek homologia agreement, from homologos agreeing; see homologate]

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American Heritage
Science Dictionary
homology   (hə-mŏl'ə-jē)  Pronunciation Key 
  1. A homologous relationship or correspondence.

  2. The relation of the chemical elements of a periodic family or group.

  3. The relation of the organic compounds forming a homologous series.

  4. A topological classification of configurations into distinct types that imposes an algebraic structure or hierarchy on families of geometric figures.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
There appears to be a homology between the principle of equality of the theory of relativity and the law of quantum entanglement.
It is understood that genes for existing antibiotics can be recognized in new organisms via homology studies.
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