from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The evolutionary change and diversification resulting from the branching off of new taxa from common ancestral lineages.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An evolutionary splitting event in which each branch and its smaller branches forms a clade.
Greek klados, branch + -genesis.(American Heritage® Dictionary of the English Language, Fourth Edition)
clado- + -genesis (Wiktionary)