WordNet (r) 3.0 (2006):

gestate
    v 1: have the idea for; "He conceived of a robot that would help
         paralyzed patients"; "This library was well conceived"
         [syn: gestate, conceive, conceptualize,
         conceptualise]
    2: be pregnant with; "She is bearing his child"; "The are
       expecting another child in January"; "I am carrying his
       child" [syn: have a bun in the oven, bear, carry,
       gestate, expect]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "gestate":
   author, be gravid, be knocked up, be pregnant, be with child, bear,
   beget, breed, bring about, bring forth, bring to effect,
   bring to pass, brood, carry, carry young, cause, conceive, cover,
   create, do, effect, effectuate, engender, establish, father, found,
   generate, give birth to, give occasion to, give origin to,
   give rise to, hatch, inaugurate, incubate, institute, make,
   occasion, originate, produce, realize, set, set afloat,
   set on foot, set up, sire, sit, work