Source : Webster's Revised Unabridged Dictionary (1913)

Phylogenesis \Phy`lo*gen"e*sis\, Phylogeny \Phy*log"e*ny\, n.
   [Gr. ? tribe + E. genesis, or root of Gr. ? to be born.]
   The history of genealogical development; the race history of
   an animal or vegetable type; the historic exolution of the
   phylon or tribe, in distinction from ontogeny, or the
   development of the individual organism, and from biogenesis,
   or life development generally.

Source : WordNet®

phylogeny
     n : (biology) the sequence of events involved in the
         evolutionary development of a species or taxonomic group
         of organisms [syn: {evolution}, {phylogenesis}]