Source : Webster's Revised Unabridged Dictionary (1913)

Gestation \Ges*ta"tion\, n. [L. gestatio a bearing, carrying,
   fr. gestare to bear, carry, intens. fr. gerere, gestum, to
   bear: cf. F. gestation. See {Gest} deed, {Jest}.]
   1. The act of wearing (clothes or ornaments). [Obs.]

   2. The act of carrying young in the womb from conception to
      delivery; pregnancy.

   3. Exercise in which one is borne or carried, as on
      horseback, or in a carriage, without the exertion of his
      own powers; passive exercise. --Dunglison.

Source : WordNet®

gestation
     n 1: the period during which an embryo develops (about 266 days
          in humans) [syn: {gestation period}]
     2: the state of being pregnant; the period from conception to
        birth when a woman carries a developing fetus in her
        uterus [syn: {pregnancy}, {maternity}]
     3: the conception and development of an idea or plan