The Collaborative International Dictionary of English v.0.48:

Systemize \Sys"tem*ize\ (s[i^]s"t[e^]m*[imac]z), v. t. [imp. &
   p. p. Systemized (s[i^]s"t[e^]m*[imac]zd); p. pr. & vb. n.
   Systemizing (s[i^]s"t[e^]m*[imac]`z[i^]ng).] [Cf.
   Systematize.]
   To reduce to system; to systematize.
   [1913 Webster]

WordNet (r) 3.0 (2006):

systemize
    v 1: arrange according to a system or reduce to a system;
         "systematize our scientific knowledge" [syn: systematize,
         systematise, systemize, systemise]