1. (biology) similarity because of common evolution;
The Collaborative International Dictionary of English v.0.48:
Homogeny \Ho*mog"e*ny\, n. [Gr. ?; ? the same + ? race, kind.]
1. Joint nature. [Obs.] --Bacon.
2. (Biol.) The correspondence of common descent; -- a term
used to supersede homology by Lankester, who also used
homoplasy to denote any superinduced correspondence of
position and structure in parts embryonically distinct
(other writers using the term homoplasmy). Thus, there is
homogeny between the fore limb of a mammal and the wing of
a bird; but the right and left ventricles of the heart in
both are only in homoplasy with each other, these having
arisen independently since the divergence of both groups
from a univentricular ancestor.
WordNet (r) 3.0 (2006):
n 1: (biology) similarity because of common evolution