[N-COUNT 可数名词]君主;帝王;女王;女皇 The monarch of a country is the king, queen, emperor, or empress.
Oxford
mon·arch/ˈmɒnək; NAmEˈmɑːnərk;ˈmɑːnɑːrk/nouna person who rules a country, for example a king or a queen 君主;帝王monarchmonarchsmon·arch/ˈmɒnək; NAmEˈmɑːnərk;ˈmɑːnɑːrk/