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# homology

[ h*uh*-**mol**-*uh*-jee, hoh- ]

## noun

*plural***ho·mol·o·gies.**- the state of being homologous; homologous relation or correspondence.
*Biology.*- 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.

homology

/ həʊˈmɒlədʒɪ /

## noun

- 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

homology

/ hə-mŏl**′**ə-jē /

- A homologous relationship or correspondence.
- The relation of the chemical elements of a periodic family or group.
- The relation of the organic compounds forming a homologous series.
- A topological classification of configurations into distinct types that imposes an algebraic structure or hierarchy on families of geometric figures.

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## Word History and Origins

Origin of homology^{1}

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## Word History and Origins

Origin of homology^{1}

*homologia*agreement, from

*homologos*agreeing; see homologate

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## Example Sentences

To find all the types of holes within a particular topological shape, mathematicians build something called a chain complex, which forms the scaffolding of homology.

So instead, homology infers an object’s holes from its boundaries, a more precise mathematical concept.

Mathematicians extract a shape’s homology from its chain complex, which provides structured data about the shape’s component parts and their boundaries — exactly what you need to describe holes in every dimension.

The idea was to take the idea of homology—similarity due to shared evolutionary history—and build a predictive model of plant variation.

The modern definition of homology is quite involved, but it is roughly a means of associating to each shape a certain mathematical object.

Homology is still determined by position, by connections, in the embryo as in the adult.

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