The Collaborative International Dictionary of English v.0.48:

Genesis \Gen"e*sis\, n. [L., from Gr. ge`nesis, fr. the root of
   gi`gnesqai to beget, be born; akin to L. genus birth, race.
   See Gender.]
   [1913 Webster]
   1. The act of producing, or giving birth or origin to
      anything; the process or mode of originating; production;
      formation; origination.
      [1913 Webster]

            The origin and genesis of poor Sterling's club.
                                                  --Carlyle.
      [1913 Webster]

   2. The first book of the Old Testament; -- so called by the
      Greek translators, from its containing the history of the
      creation of the world and of the human race.
      [1913 Webster]

   3. (Geom.) Same as Generation. Genet

WordNet (r) 3.0 (2006):

genesis
    n 1: a coming into being [syn: genesis, generation]
    2: the first book of the Old Testament: tells of Creation; Adam
       and Eve; the Fall of Man; Cain and Abel; Noah and the flood;
       God's covenant with Abraham; Abraham and Isaac; Jacob and
       Esau; Joseph and his brothers [syn: Genesis, Book of
       Genesis]