/heuh mol"euh jee, hoh-/ , n. , pl. homologies .
1. the state of being homologous; homologous relation or correspondence.
a. a fundamental similarity based on common descent.
b. a structural similarity of two segments of one animal based on a common developmental origin.
3. Chem. 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 .
4. Math. a classification of figures according to certain topological properties.
[ 1650-60; homología agreement, equiv. to homólog ( os ) HOMOLOGOUS + -ia -Y 3 ]