noun, plural supremos. Chiefly British Informal.
the person in charge; chief.
a person of supreme or complete power, authority, ability, etc.: His victory makes him the new chess supremo.
or Italian supremo,
both < Latin suprēmus supreme1
; E sense perhaps especially < Spanish El Supremo
as the title of Latin-American dictators, e.g., J. G. Rodríguez Francia (1766–1840), Paraguayan dictator