Definition of: homotaxis

(hō′mə·tak′sis, hom′ə-) noun
1. Classification in the same category.
2. Geol. The assignment to the same period in the life history of the earth of those groups of strata exhibiting the same general faunal characteristics, however widely separated from one another geographically; similarity of fossil formations.
—ho′mo·tax′i·al, ho′·mo·tax′ic adjective
—ho′mo·tax′i·al·ly adverb