The Collaborative International Dictionary of English v.0.48:

Sporulation \Spor`u*la"tion\ (sp[o^]r`[-u]*l[=a]"sh[u^]n), n.
   (Biol.)
   The act or process of forming spores; spore formation. See
   Illust. of Bacillus,
   (b) .
       [1913 Webster]

WordNet (r) 3.0 (2006):

sporulation
    n 1: asexual reproduction by the production and release of
         spores [syn: monogenesis, sporulation]