1. (n.) A sole or supreme ruler; a sovereign; the highest ruler; an emperor, king, queen, prince, or chief.

2. (n.) One superior to all others of the same kind; as, an oak is called the monarch of the forest.

3. (n.) A patron deity or presiding genius.

4. (n.) A very large red and black butterfly (Danais Plexippus); -- called also milkweed butterfly.

5. (a.) Superior to others; preeminent; supreme; ruling.

anointed king boss chief chieftain crowned head czar dynast emperor empress grand duke high chief imperator king king-emperor kinglet lord lord paramount majesty master overlord owner paramount petty king potentate prince prince consort queen royal royal personage royalty ruler sovereign suzerain tetrarch