The Collaborative International Dictionary of English v.0.48:

Pregnancy \Preg"nan*cy\, n.
   1. The condition of being pregnant; the state of being with
      young.
      [1913 Webster]

   2. Figuratively: The quality of being heavy with important
      contents, issue, significance, etc.; unusual consequence
      or capacity; fertility. --Fuller.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pregnancy
    n 1: the state of being pregnant; the period from conception to
         birth when a woman carries a developing fetus in her uterus
         [syn: pregnancy, gestation, maternity]