n. The chief of a monarchy; a supreme governor for life, entitled variously emperor (or empress), king (or queen), czar (or czarina), sultan, shah, etc.; primarily, a sole or autocratic ruler of a state, but in modern times generally a hereditary sovereign with more or less limited powers. See monarchy.n. Any possessor of absolute power or superiority; one who or that which holds a dominating or preëminent position, literally or figuratively: as, the oak is the monarch of the forest.n. Synonyms King, etc. (see prince), potentate, autocrat, despot.