<p><strong>Noun</strong></p><ul><li>plural: homologies.</li><li>the state of being homologous; homologous relation or correspondence.</li><li>Biology: a fundamental similarity based on common descent.</li><li>a structural similarity of two segments of one animal based on a common developmental origin.</li><li>Chemistry: the similarity of organic compounds of a series in which each member differs from its adjacent compounds by a fixed increment, as by CH₂.</li><li>Mathematics: a classification of figures according to certain topological properties.</li></ul>