anagenesis Syllabification: (an·a·gen·e·sis)Pronunciation: /ˌanəˈjenəsis/Definition of anagenesis noun Biology species formation without branching of the evolutionary line of descent. Compare with cladogenesis.Derivatives anageneticPronunciation: /-jəˈnetik/ adjective anagenesis in other Oxford dictionaries Definition of anagenesis in the British & World English dictionary