The Collaborative International Dictionary of English v.0.48:

Stratocracy \Stra*toc"ra*cy\, n. [Gr. ? an army + -cracy, as in
   democracy: cf. F. stratocratie.]
   A military government; government by military chiefs and an
   army.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stratocracy
    n 1: government by the military and an army [syn: military
         government, stratocracy]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

STRATOCRACY. A military government; government by military chiefs of an
army.