Etymology
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generalissimo (n.)

"supreme military commander," 1620s, from Italian generalissimo, superlative of generale, from a sense development similar to French general (see general (n.)). Parson Weems applied it to George Washington. In 20c. use sometimes from Spanish generalísimo in reference to the military dictator Franco.

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Definitions of generalissimo

generalissimo (n.)
the officer who holds the supreme command;
Synonyms: commander in chief / commander-in-chief
From wordnet.princeton.edu