generalissimo Meaning, Definition & Usage

  1. noun the officer who holds the supreme command
    commander in chief.
    • in the U.S. the president is the commander in chief

WordNet

Gen`er*al*is"si*mo noun
Etymology
It., superl. of generale general. See General, a.
Definitions
  1. 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 countries.

Webster 1913