Pronunciation: (su-prē'mō, soo-), [key]
—pl. -mos. Chiefly Brit. Informal.
1. the person in charge; chief.
2. a person of supreme or complete power, authority, ability, etc.: His victory makes him the new chess supremo.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.