from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Similarity of stratigraphic arrangement and fossils in noncontemporaneous or widely separated geologic deposits.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. similarity in arrangement of parts
from the GNU version of the Collaborative International Dictionary of English
- n. Similarly in arrangement of parts; -- the opposite of heterotaxy.
from The Century Dictionary and Cyclopedia
- n. A term introduced into geology by Huxley, to express the idea of similarity of arrangement or of order in the fossiliferous deposits of various regions, while not necessarily including that of contemporaneity in the same: opposed to heterotaxis.
From Ancient Greek the same + arrangement. (Wiktionary)