n. 大元帅, 大总统, 总司令

[ noun ]
the officer who holds the supreme command
<noun.person>
in the U.S. the president is the commander in chief

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
countries.