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Meaning of cladogenesis

clad•o•gen•e•sis

Pronunciation: (klad"u-jen'u-sis, klā"du-), [key]
— n. Biol.
  1. evolutionary change by the branching off of new species from common ancestral types.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.