The Collaborative International Dictionary of English v.0.48:

phylogenesis \phy`lo*gen"e*sis\
   (f[imac]`l[-o]*j[e^]n;[-e]*s[i^]s), phylogeny \phy*log"e*ny\
   (f[imac]*l[o^]j"[-e]*n[y^]), n. [Gr. fy^lon race, tribe + E.
   genesis, or root of Gr. gi`gnesqai to be born.]
   The history of genealogical development; the sequence of
   events involved in the evolutionary development of a species
   or taxonomic group of organisms; 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.

   Syn: evolution.
        [1913 Webster]

WordNet (r) 3.0 (2006):

phylogeny
    n 1: (biology) the sequence of events involved in the
         evolutionary development of a species or taxonomic group of
         organisms [syn: evolution, organic evolution,
         phylogeny, phylogenesis]