From The Collaborative International Dictionary of English v.0.48:

Generalissimo \Gen`er*al*is"si*mo\, n. [It., superl. of generale
   general. See General, a.]
   The chief commander of an army; especially, the commander in
   chief of an army consisting of two or more grand divisions
   under separate commanders; -- a title used in most foreign
   [1913 Webster]
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