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[huh-mol-uh-jee, hoh-] /həˈmɒl ə dʒi, hoʊ-/
noun, plural homologies.
the state of being homologous; homologous relation or correspondence.
  1. a fundamental similarity based on common descent.
  2. 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.
Origin of homology
1650-60; < Greek homología agreement, equivalent to homólog(os) homologous + -ia -y3 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for homology
Historical Examples
  • homology is still determined by position, by connections, in the embryo as in the adult.

    Form and Function E. S. (Edward Stuart) Russell
British Dictionary definitions for homology


noun (pl) -gies
the condition of being homologous
(chem) the similarities in chemical behaviour shown by members of a homologous series
(zoology) the measurable likenesses between animals, as used in grouping them according to the theory of cladistics
Word Origin
C17: from Greek homologia agreement, from homologos agreeing; see homologate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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homology in Science
  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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